I washed my hand while holding it and went to work.
What did you do with the key afterwards?
I used it as a paper weight at my workplace.
I'm glad that you bothered to wash your hands. You should feel good about yourself that you are someone who takes hygiene seriously.
I was going to throw the key in the trash but then I thought that washing it was a better idea.
There's never a need to throw something away when you can just wash it. It's good that you did so, while also washing your hands. Some people wouldn't wash either.