Your locksmiths may be able to get the car open if the keys are inside but it may be too late for the kid that took them – see this horrific story-
http://www.keloland.com/newsdetail.cfm/pastor-boy-found-in-trunk-had-keys-with-him/?id=150928
Parents watch your kids! At all times know where they are… and make sure the keys are kept far from their reach…