This is a '99, but it should be similar. It appears that the lock cylinder is held into the lock mechanism bracket via a sleeve that fits over the cylinder and has a larger flange on the bottom that keeps it in. My guess is that the sleeve has come off or broken a snap and is now lying in the cavity under the center console. You can access this area fairly easily by removing the ashtray and surround.
This is the best I could do without removing the entire console...hope it helps!
Good luck!
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