Sliding doors on patios and decks are more vulnerable than your main front door. The locks are easier to pick, and even just an extra hard pull can get through many locks. It’s best to add some extra security to your sliding doors. This can be as simple as laying a bar, broomstick, or piece of plywood in the door track, but many homeowners prefer a more sophisticated method. In that case, you can buy locks that fit onto the bottom or top of the door to add extra protection.