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How to Fix a Stopped Composite Door Replacement Lock Although composite doors are of high quality, they may still have some problems. Thankfully, these can often be repaired quickly and easily. One of the most frequent issues is that the lock becomes stuck or becoming difficult to open and close. This is often solved by lubricating your lock cylinder and mechanism. 1. The lock is jammed. It can be a hassle as a homeowner if your front door doesn't close properly. This can not only cause draughts in your h