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How to Fix a Composite Door Replacement Lock Many homes have a composite door installed due to their attractive appearance, enhanced security and insulation properties. Most problems with these doors are due to a malfunctioning mechanism, and can usually be fixed without the need to replace your composite door. A lock that is sticky is a frequent issue that occurs when it is difficult to insert or turn the key. You can fix this problem by lubricating the door lock's internal mechanisms. Warped Doo