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Replacement Lock For Composite Door If your key doesn't turn in your composite door, it could be an issue with the cylinder or gearbox. Christopher The Locksmith recommends upgrading to a security upgrade because older locks don't have the anti-bumping, anti-drilling or anti-snap features that are now standard on new doors. Deadbolt Composite doors are a fantastic option for any home, enhancing appearance and providing superior security. Like other products, they are not resistant to problems