How Do I Show That I'm Interested?

I have a huge crush on one of the workers at our local grocery store. I'm pretty shy around people I don't know well, and very shy around people that I find attractive. We've done the usual "How's your day?" thing but other than that- nothing. I was just hoping for some advice on how I should handle the situation? What the best way to show that I'm interested but hopefully in a subtle way so if he's in no way interested I can still shop there? Thanks!
How Do I Show That I'm Interested?
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