I don't know what you mean about keys. There are two access plates on the auger you can remove. Then all you have to do is pull the clips out of the plastic finger holder to remove the steel finger.
Assuming the finger has broken off. I remove both access panels. Then attach vise grips to the broken finger stub remaining in plasic collar. Then I insert a long screwdriver into the guide hole , and pry the clip off. I hope this makes sence long day in combine. Eyes are blury.