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Install a French Door Lock to Prevent Burglars From Getting Through French doors look beautiful in any house, however they can be an invitation to burglars if they are not secured properly. To prevent this, install a door lock to help keep your belongings and family secure. If your French door locks aren't working, there may be an obstruction blocking the lock cylinder. Clean and grease the mechanism to ensure that the latch, catch, and bolt are operating smoothly. Mortise lock Mortise locks provid