How do I get a guy's number at a museum?

I really do like to go to art exhibits and museums, but most of the time, I end up talking to the older generations. If I do talk to a guy around my age, it's still about the artifact in front of us, and then we end up leaving each other when we concentrate on something else.
I recently went to this interactive museum with secret doors & I was engaging with this guy, but I lost in one of the secret rooms
Even still, we were talking about finding the next secret door.
How do I get a guy's number at a museum?
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