Unable to turn the key in the ignition at all.
This is a very common problem with the type of vehicle you have. If your ignition key looks worn down at all the key will need to be replaced. On some occasions the lock cylinder will need to be replaced as well if it is too worn. To get a new key you will need to take your vehicle registration card to a dealer affiliated with General Motors (Chevy, GMC, Buick) and they will cut a new key for you.
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