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Replacement Lock For Composite Door If your key does not turn on your Composite Door, it could be that the gearbox or cylinder is defective. Christopher The Locksmith would recommend upgrading to a security lock as older models don't have the anti-drill, bump, or anti-snap functions that are now standard on new doors. Deadbolt Composite doors are a great option for any home. They are stylish and offer superior security. However, just like everything else, they are not impervious to issues that may arise