Toyota Repair: ignition on a 95 4runner, lock cylinder, toyota dealer

Question
my key wont turn, could it be the tumbler or the ignition switch

Answer
In most cases it's the ignition lock cylinder, if the key works in all the doors but not the ignition switch then I would recommend replacing the lock cylinder, if the key has trouble in the door locks then I would make a new key using the VIN#, the toyota dealer can make a new key using the VIN.