When my mom (with dementia) was in my car, she would lock the door about every 5 minutes--nervous habit. She was in the passenger seat and had access to lock all the doors. When I'd get out, like to put something in the mailbox, I'd come back and all the doors were locked. Then it took me about 5 minutes (okay exaggerating, but it felt like 5 minutes, or 5 hours!) to explain to her how to push up on the lock to unlock the doors. So I got in the habit of never closing the door all the way.