You've laid out the ways a 2.4GHz signal can be jammed.
You've not laid out why this would not also apply to a 5GHz signal.
However, you have brought up a good reason to avoid such constructions altogether.
The state of your door lock should not depend on the state of your router or phone.
My smart lock is internally smart. 30 seconds after being unlocked, it locks itself.
No matter how it was opened....poof, it automagically does its own thing.
I don't have to worry about where the phone is in relation to the door, to determine its locked status.
Its default state is locked.