lock crazy
When your paranoid roommate is alone for an extended period of time and gets in the habit of deadbolting the door, then when you return from a trip you constantly get locked out (even with your key). Their habit tends to be hard to break.
Used in a sentence:
My lock crazy roommate keeps deadbolting the damn door, and this makes me angry when it is lightning outside.
My lock crazy roommate keeps deadbolting the damn door, and this makes me angry when it is lightning outside.