The only thing you can do is wait for it to start again. Sometimes it takes 10 minutes... sometimes longer. Then you need to get a new ignition cylinder with a new passlock sensor and install that, do a security relearn and you shouldn't have a problem again.
Protip: If you don't know what you're doing, don't do it.
My car is sitting at Jim Gauthier's (dealership) right now with the same problem. Was at 7/11 Friday night, went to start car, wouldn't crank (typical passlock garbage), message center said "service air bag", and to boot, I couldn't take the key out of the igntion even though it was in park. Also, everything electrical (radio, onstar, etc.) worked fine except the windows/door locks. Checked all fuses, disconnected battery, still nothing. Had to have it towed to dealership (free and quick thanks to GM Roadside Assistance) and leave it there with key stuck in ignition and doors unlocked. At this point, the car has no power whatsoever, nothing works at all so we're all thinking BCM issues. I'm waiting to hear back from the dealership, it'll probably be a few days.
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