I wouldn't worry about this unless it is a recurring problem. I have had it not recognize the key once or twice throughout the 2 years Ive had this car. I don't know if your key gets physically stuck in the slot or maybe the car holds onto it and forgot to let go from the ignition mode.
Well, if the G6's get the same problem the GTOs do, you'll have to end up getting a new ignition OR pulling it apart and dremeling down the slide that the pin rubs against. (If you pull it apart you'd know what I'm talking about.
Otherwise, hopefully it's not a reoccurring problem.