Asking a shy coworker to hangout?

So I have this super shy coworker who I like very platonically as a friend and would like to see if maybe he might want to hangout with me sometime. But I don't know what to ask him to go do with me because I know he's a picky eater and don't think he goes out much I know he likes books. And metal music.

Asking a shy coworker to hangout?
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