Like most items with moving parts, locks need to be lubricated from time to time in order to keep them working smoothly.
It's usually pretty easy to tell if a lock needs lubrication because if it does you'll have a difficult time getting the key to slide in or out of the keyhole, and occasionally the key won't turn the lock once it has been fully inserted.
The most effective way to lubricate the inside of a lock is to squirt a little graphite into the keyhole, then insert and remove the key a few times to spread the graphite around and onto all the little parts that comprise the locking mechanism. Next, turn the key a few times and you should notice a big difference right away.
Graphite typically comes in a small tube with a pointed tip that is specifically designed to be inserted into a keyhole. Once you have the graphite on hand the entire process takes all of 10 seconds.
You can pick up a tube for just a few dollars at any hardware or home improvement store. You can also get it at most auto parts stores or other establishments that make spare keys.
If I remember correctly, I bought my last tube of graphite in the Tire & Lube Express (TLE) section of our local Wal-Mart, but you can also get it online at Amazon.
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