We went through that phase with Benjamin, he was always locking doors as he went out of a room. We had the doorknobs where you just needed a straight round stick to pop the lock. So we had lollipops on the lintels over all the doors so we could open the doors with the stick part of it. I don't know what we'll do in this house, it has the handle kind of door instead of knob, and it is a different kind of lock.