I carried these two keys for nearly 30 years. They were worn smooth and getting very thin. The ignition key was so worn I could pull the key out with the engine running. Then one day, I dropped them on the concrete, and the ignition key broke in half.
The door key was so worn, I had to have just the right touch and a few wiggles, and hold my tongue to the left and stand on one foot to get the door open. I decided after the key broke, to get a new door key from a master that was not used much. The ignition switch was replaced when I had to take the steering column apart to replace the turn signal switch had broken and would not work right. The ignition lock was just a simple swap with a new GM switch I bout 20 years ago for stock. I had the new ignition lock re-keyed to use the door key before I installed it.
Stuff one must do every 370,000 miles or so on a GM G Body vehicle.