I just changed mine. Got stuck, had to tow vehicle. Key would not turn to do the easy disassembly. Wiggled for hours over several days.

Saw a post on here to use vibration with a jigsaw. Pressed the jigsaw handle against the key and used a wrench to turn key at same time, turned in 30 secs due to the vibration! Disassembly of tumbler was 5 mins

Thanks to the people here!