Engine does not run out

Hello guys, I talked to a friend today. He told me that his 98 iger 2.0 16 V is still running for about 5 minutes after the figure. He also pulled the ignition key. He checked the ignition lock. This is fine. Since we both don’t have a plan I wanted to ask you if anyone knows this phenomenon. I got the search function through. Can anyone help me??? gruss Zäpi