How do I flirt with the coffee guy?

So I'm kind of clueless at flirting. I'm fine if I'm texting someone, but in person it just seems weird, fake, or forced and I feel like an idiot. Well anyway I have a slight crush on my coffee shop guy. What are ways I can flirt with him without being too obvious? Or would I just seem weird to flirt with the guy that makes my coffee? I go to this coffee shop a lot so I don't want to make a fool of myself, and have to never return. Thanks
How do I flirt with the coffee guy?
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