The ignition lock cylinder tumblers get in a bind all the time on GM vehicles. It probably has little to do with inseting the wrong key. Try inserting the correct key and "jiggle" the key in the lock. You may have to jiggle it up and down and rotate (or try to rotate) the lock cylinder forward and backward. It will probably work just fine if you can wiggle it with just the right combination. If not, you may have a damaged lock cylinder and you will have to replace it. - most likely nothing you did....I change at least two or three of these things every week...VERY COMMON.
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