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Without a key you cannot remove the lock alone. You must remove the ignition housing. It is fitted with shear bolts when new, so where the bolts sheared off will look like two spherical dome. Use a small sharp chisel to start unscrewing them the first turn or so, after that, they will only be finger tight.
Check for a hand written code in the owners manual , sometimes previous owners are smart enough to write it down.. if not stop in to a dealer and they will unlock it for free... be sure to write it down after.
never did it in a 2002 chvy first off...go to napa...or what ever your local part store is and buy a manual...easy repair...the manuel gives pictures...you replace one end from under the hood...the other you may have to get under the car...if your skinny no prob..if not ...get some jacks...book will explain all..easyl..repair...