For the smart-lock
Add a “Quiet-Mode” which twists the smart-lock slower and so makes less noice.
My smart-lock is installed on our apartment door which is near the childrens room.
I don’t use the smart-lock when the kids are sleeping because the smart-lock is rather loud.
Maybe the volume could be reduced by moving the engine slower.
The Quiet-Mode should be schedulable, to automatically activate it at night.
Make the smart-lock useable in families with children.