This 1999 Jeep Cherokee came in with the complaint that the key would not turn off. I pulled it in the shop and pulled the fuel pump relay from the under hood fuse box so the engine would die.
The customer had already made a mess of the steering column covers so I actually had to put it back together to show how easy it is to remove the lock cylinder on this vehicle. The key has to be on, in order to depress the retaining pin through the steering column lower cover as shown below.
A better picture of the pin or button that has to be depressed with the key on. Much harder to do if the lock cylinder gets stuck in the off position.
Once the pin is depressed the lock cylinder will pull out of the steering column housing. Slide a new on and it is done.
This customer opted for a slightly less expensive preassembled lock cylinder. I prefer the ones that come as a kit. That way it can be set up for the original key.