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How to Fix a Composite Door Replacement Lock Many homes have composite doors installed due to their attractive appearance, enhanced security and insulation properties. The majority of issues with composite doors are caused by a defective mechanism, which can be corrected without the need to replace the door. A sticky lock is a common problem that occurs when it is difficult to insert or turn the key. This issue can be solved by oiling the internal mechanisms of your door lock. Warped Doors Composite door