Hi John,
Have a look at 
State Notifications & Actions Blueprint. It includes “Start” and “End” states with action buttons and associated actions. “Start” for when the garage is open and “End” for when the garage is closed.
I’m planning to add a recurring message option to keep reminding you until the task is done, though I don’t have a timeline for that feature yet.
That said, this blueprint should still be useful for your needs.
Blacky 