how does the rear hatch key hole even work?

[ex-x-fire]

To unlock it needs to turn counter clockwise, keep lubing it.

[06YarisRS]

Originally Posted by ex-x-fire

...keep lubing it.

Yes! This is key Every Yaris hatchback I have bought used had a jammed tumbler. It can take several applications of stuff like brake cleaner and gently wiggling the key back and forth to free it up. Patience and gentle turning back and forth is the way. Then spray in a light machine oil. I just remove them from the car now, disassemble, clean and lubricated them and reinstall. Once it's off the car, you remove one snap ring and the tumbler assembly slides out so you can clean the cylinder bore and lubricate it. On one, I actually polished the cylinder bore with a polishing tip on my dremel tool. It is amazing how much junk builds up in there. I keep spraying the bits and pieces until the brake cleaner runs runs clear.