How do you approach a cashier to meet them?

Long story short there’s an attractive cashier I saw last week at the nearby Wal*Mart and since I just went through the most confusing hell of my life and I’m tired of being a lonely dude who doesn’t really ever get to hang out with anyone- I’ve decided I’d like to approach her and make a new friend, or possibly more.

Thing is, I’m not really sure how to go about it. She was incredibly friendly- far more than any other cashier I’ve dealt with, and I was thinking of using that to casually ask if she’d like to hang out some time… but I’ve never done something so ballsy, or blunt. As in I’ve never asked anyone out or really made a friend by approaching them like that. So I’m pretty clueless on how that might play out. I’m 18, and she looks to be around the same general age.

tl;dr: There’s a cute cashier I’d like to meet, how can I do this without being creepy or make a fool of myself.