r/Seddit, how do you go about picking up a cashier? Say, at a grocery store?

Ideally, I would do it the first day I saw her, and ended up in her line. But, in this case I'm referring to specifically, I balked at closing anything the first time, just random small talk. I ended up in her line a few times since then, continuing small talk, and finally I made the formal introduction the other day. I was in her line today, and she said she was thinking of me yesterday because I didn't come in, so I know that she's interested. So, what's my next move? Of course I stalked her out on Facebook and found her profile, would it be weird to send a friend request out of the blue? Maybe with a note along with it with the disclaimer "i hope this isn't creepy that I found you on here, but I figured I'd send a request..." bullshit? Or is that lame? Can anyone help me out? I need another person's perspective...