You can use several types of deadbolt locking mechanisms to secure sliding doors. For example, foot bolt locks attach to the bottom of the door and operate by pressing a button with your foot. These bolts can provide an additional layer of security and make it much more difficult for someone to force the door open Mortise locks are generally considered the most common sliding door lock, and most will come with a built-in mortise lock. They can sit hidden away inside the sliding door's pocket, therefore maintaining the streamlined look that sliding doors are famous for. Sliding lock 1 side key 1 side knob.