Glove box lock problems

My glove box lock worked about 3 times when I bought the car, but after the 4th and final opening, the key failed to operate the mechanism. Luckily, the door was open when the lock failed, so I was able to remove it. But now, I have an open glove box with no lock (or latch to keep it closed).

How do I troubleshoot the lock? I've tried saturating it in WD40 and trying to work the mechanism, to no avail. To me, it feels like I'm trying to unlock it with the wrong key, if that makes sense. It...

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