How to catch crush's attention (he's a cashier)?

So I think I have a crush on this guy that works at Bilo. I've been through his checkout lines several times before but I get nervous to talk to him. I saw him at a football game last week and he smirked at me when he saw me... What does that mean? The next day I saw him at Bilo and he didn't really smile or talk?
How to catch crush's attention (he's a cashier)?
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