Deadbolts can only be engaged when you’re working with a door that is shut. If the door is open, then you aren’t able to mess with the lock in any manner. The bolt goes into the designated spot in the wall, and it holds the door as secure as it can be. The only way that you can move a deadbolt is by using the key that is meant for that deadbolt. Otherwise, the door is securely locked and will keep you and your home as safe as possible. It sounds really simple, but this simple option can go a long way in keeping your home secure.