diff --git a/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_instances_controller.py b/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_instances_controller.py
index 489b710c..a2972793 100644
--- a/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_instances_controller.py
+++ b/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_instances_controller.py
@@ -170,7 +170,17 @@ def process_instance_terminate(
     """Process_instance_run."""
     process_instance = _find_process_instance_by_id_or_raise(process_instance_id)
     processor = ProcessInstanceProcessor(process_instance)
-    processor.terminate()
+
+    try:
+        processor.lock_process_instance("Web")
+        processor.terminate()
+    except (ProcessInstanceIsNotEnqueuedError, ProcessInstanceIsAlreadyLockedError) as e:
+        ErrorHandlingService().handle_error(processor, e)
+        raise e
+    finally:
+        if ProcessInstanceLockService.has_lock(process_instance.id):
+            processor.unlock_process_instance("Web")
+
     return Response(json.dumps({"ok": True}), status=200, mimetype="application/json")
 
 
@@ -180,7 +190,18 @@ def process_instance_suspend(
 ) -> flask.wrappers.Response:
     """Process_instance_suspend."""
     process_instance = _find_process_instance_by_id_or_raise(process_instance_id)
-    ProcessInstanceProcessor.suspend(process_instance)
+    processor = ProcessInstanceProcessor(process_instance)
+
+    try:
+        processor.lock_process_instance("Web")
+        processor.suspend()
+    except (ProcessInstanceIsNotEnqueuedError, ProcessInstanceIsAlreadyLockedError) as e:
+        ErrorHandlingService().handle_error(processor, e)
+        raise e
+    finally:
+        if ProcessInstanceLockService.has_lock(process_instance.id):
+            processor.unlock_process_instance("Web")
+
     return Response(json.dumps({"ok": True}), status=200, mimetype="application/json")
 
 
@@ -190,7 +211,18 @@ def process_instance_resume(
 ) -> flask.wrappers.Response:
     """Process_instance_resume."""
     process_instance = _find_process_instance_by_id_or_raise(process_instance_id)
-    ProcessInstanceProcessor.resume(process_instance)
+    processor = ProcessInstanceProcessor(process_instance)
+
+    try:
+        processor.lock_process_instance("Web")
+        processor.resume()
+    except (ProcessInstanceIsNotEnqueuedError, ProcessInstanceIsAlreadyLockedError) as e:
+        ErrorHandlingService().handle_error(processor, e)
+        raise e
+    finally:
+        if ProcessInstanceLockService.has_lock(process_instance.id):
+            processor.unlock_process_instance("Web")
+
     return Response(json.dumps({"ok": True}), status=200, mimetype="application/json")
 
 
diff --git a/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_processor.py b/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_processor.py
index 5e771c12..fda3d395 100644
--- a/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_processor.py
+++ b/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_processor.py
@@ -1249,7 +1249,7 @@ class ProcessInstanceProcessor:
         self.add_step()
         self.save()
         # Saving the workflow seems to reset the status
-        self.suspend(self.process_instance_model)
+        self.suspend()
 
     def reset_process(self, spiff_step: int) -> None:
         """Reset a process to an earlier state."""
@@ -1292,7 +1292,7 @@ class ProcessInstanceProcessor:
                 db.session.delete(row)
 
             self.save()
-            self.suspend(self.process_instance_model)
+            self.suspend()
 
     @staticmethod
     def get_parser() -> MyCustomParser:
@@ -1900,16 +1900,14 @@ class ProcessInstanceProcessor:
         db.session.add(self.process_instance_model)
         db.session.commit()
 
-    @classmethod
-    def suspend(cls, process_instance: ProcessInstanceModel) -> None:
+    def suspend(self) -> None:
         """Suspend."""
-        process_instance.status = ProcessInstanceStatus.suspended.value
-        db.session.add(process_instance)
+        self.process_instance_model.status = ProcessInstanceStatus.suspended.value
+        db.session.add(self.process_instance_model)
         db.session.commit()
 
-    @classmethod
-    def resume(cls, process_instance: ProcessInstanceModel) -> None:
+    def resume(self) -> None:
         """Resume."""
-        process_instance.status = ProcessInstanceStatus.waiting.value
-        db.session.add(process_instance)
+        self.process_instance_model.status = ProcessInstanceStatus.waiting.value
+        db.session.add(self.process_instance_model)
         db.session.commit()
diff --git a/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_service.py b/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_service.py
index 5e149965..d7ea5613 100644
--- a/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_service.py
+++ b/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_service.py
@@ -25,6 +25,7 @@ from spiffworkflow_backend.models.process_instance_file_data import (
 from spiffworkflow_backend.models.process_model import ProcessModelInfo
 from spiffworkflow_backend.models.task import Task
 from spiffworkflow_backend.models.user import UserModel
+from spiffworkflow_backend.services.assertion_service import safe_assertion
 from spiffworkflow_backend.services.authorization_service import AuthorizationService
 from spiffworkflow_backend.services.git_service import GitCommandError
 from spiffworkflow_backend.services.git_service import GitService
@@ -95,6 +96,13 @@ class ProcessInstanceService:
         )
         process_instance_lock_prefix = "Background"
         for process_instance in records:
+            with safe_assertion(process_instance.status == status_value) as false_assumption:
+                if false_assumption:
+                    raise AssertionError(
+                        f"Queue assumed process instance {process_instance.id} has status of {status_value} "
+                        f"when it really is {process_instance.status}"
+                    )
+
             locked = False
             processor = None
             try:
diff --git a/spiffworkflow-backend/tests/spiffworkflow_backend/integration/test_process_api.py b/spiffworkflow-backend/tests/spiffworkflow_backend/integration/test_process_api.py
index 086841c0..f7f644dd 100644
--- a/spiffworkflow-backend/tests/spiffworkflow_backend/integration/test_process_api.py
+++ b/spiffworkflow-backend/tests/spiffworkflow_backend/integration/test_process_api.py
@@ -1418,7 +1418,7 @@ class TestProcessApi(BaseTest):
         )
         processor.save()
 
-        processor.suspend(process_instance)
+        processor.suspend()
         payload["description"] = "Message To Suspended"
         response = client.post(
             f"/v1.0/messages/{message_model_identifier}",
@@ -1430,7 +1430,7 @@ class TestProcessApi(BaseTest):
         assert response.json
         assert response.json["error_code"] == "message_not_accepted"
 
-        processor.resume(process_instance)
+        processor.resume()
         payload["description"] = "Message To Resumed"
         response = client.post(
             f"/v1.0/messages/{message_model_identifier}",