Locksmiths have long used powdered graphite to lubricate the workings of locks, and if your key refuses to slide fully into the lock, you can do the same. But there’s an easier (and less expensive!) ...

Sticky door locks are fairly common in colder, damp weather, and a little lubricant will usually get them working smoothly. The lubricant most often recommended is powdered graphite, which is sold in ...