There's an internal piece of the lock mechanism that breaks fairly frequently. I just replaced it on one of my cars using part of a VW repair kit from Amazon. There's a few threads back through the years that talk about it.
Here's one: http://986forum.com/forums/diy-project-guides/45967-how-fix-broken-lock-cylinder-20-dollars.html
Post #29 by Dubaday has some good detail.
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