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From personal experience, any GM shop can do it. The dealer I bring my car to wasn't able to unlock the deck when my steering column locked because their tech was out to lunch. I decided to try my luck with a local Pontiac dealer, and they did it in 5 min w/out a charge.
Any dealer should be able to do it. I had mine locked and they walked me through it over the phone. They have to get your radio's code then get the unlock code for it. Takes only about 5 minutes.
My local dealer charged me $30 because "I didn't buy it from them"! I had previously purchased a new Yukon and Cadillac STS from them....nice guys!!??? :mad