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How to Fix a Composite Door Replacement Lock Many homes have composite doors fitted for their attractive good looks with improved security and insulation properties. The majority of problems with composite doors result from a faulty mechanism, which can be corrected without replacing the door. A sticky lock is a common issue that is caused by difficult to insert or turn the key. You can fix this problem by lubricating the door lock's internal mechanisms. Warped Doors Composite doors are extremely robust,