ALPHA-TAF.WEST801 Universal knob, Sometimes the key won't come out

"Sometimes I can't get the key out."

It's called Dimple Key, but I wonder if it's MIWA. When I arrived at the site, I confirmed that it was the knob of WEST801. I asked the client to operate it, but it turned out to be an operation error because he was trying to pull it out at a position where it couldn't be pulled out. Up until now, I had probably been unconsciously returning it to its original position, but this morning it seems like something felt strange and my consciousness locked up, so I turned it 90 degrees and tried to pull it out.