HiCustomerthis is lostrider, if the key wont turn in the ignition, then the tumblers in the key cylinder have malfunctioned and the key cylinder will have to be drilled out and a new one built and installed, if you use one from a parts house the keys will have to be programed to the truck, and that will mean a trip to the dealer anyway, so the best bet is to have the dealer build you a cylinder and install it that way the ignition keys will still fit the doors, but you can try this and if it works it wont work over and over, remove the plastic covers on the steering column and just under the key cylinder, take a small hammer and tap on the housing where the key cylinder slides into the steering column while trying to turn the key, sometimes the tapping will jar the tumblers back into place, if that don't work, then its the drill.
Here is the procedure:Hope this helps.
Removal and Installation
CAUTION: Do not use a prying device to detach the shift lever boot or damage to the shrouds may result.
thats where the drilling gomes in, here is that procedure,
CAUTION: Do not allow the drill bit to make contact with the column housing or damage to the housing will result. If there is damage to the housing a new column must be installed.