Key will not turn in ignition and auto trans stuck in Park

Because I thought the problem actually had something to do with the transmission and not the ignition switch I tried using the "shift lock override button" which is accessible through a little plastic button next to the shifter that you pry off, as per the owner manual: If you cannot shift the selector lever out of “P” position to other positions even though the brake pedal is depressed, use the shift lock override button as follows: 1. Turn the ignition key to “LOCK” position. Make sure the parking brake is on. 2. Pry up the cover with a flat-bladed screwdriver or equivalent. 3. Insert the screwdriver or equivalent into the hole to push down the shift lock override button. You can shift out of “P” position only while pushing the button. 4. Shift into “N” position. 5. Insert the cover. 6. Start the engine. For your safety, keep the brake pedal depressed. Be sure to have the system checked by your Toyota dealer as soon as possible. I was then able to then shift the shifter to N but the key would still not turn beyond the accessories position. So maybe it is the ignition switch?