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Your tumblers are worn or your key. You can try the up and down jiggle or pulling the key out slightly and then turning it. Try a spare key if you have one. Other than that you need to replace your key cylinder in your ignition. Since the sterring wheel is moving its not locked. Unless you have alot of play and then you need to pull harder to get it to unlock.
2003 Jetta left rear window blue plastic part of the