take it off and take it to a lock smith hell some come to your house
Yeah, if you can't grab it with tweezers or back it out with a t-pin (like you find in the crafts departments of Wal-Mart of Target), call the dealer and have the recommend a locksmith (to get one that understands ignition locks). I hope you don't have it in a fork-lock position, because at least you can still roll the bike as needed.
I guess this is at home, not in a parking lot somewhere?