Instead of a pick up line, complimenting (you can do this later), proffessional introduction (Hi my name is, hows your day?. I find it easier and less awkward if you dont rehearse what you want to say or memorize lines, that makes you sound dumb nervous.
1. Comment on something small (surroundings, their clothing, w.e they're eating, class, etc)
2. Act "interested" in w.e the **** she says
3. Squeeze in a corny joke.
4. Make believe you're on the run and scoop them digits.
You: Hey, what is that? It looks pretty good.
Her: Yamb sandwich
You: O cot dang! Do you usually get that.
Her: Mhmmmmm
You: I like a girl that eats healthy. All I get is quarter pounders with cheese extra bacon supersized.
Her: blah blah blah
You: Anyway, i g2g meet a friend. We should hang some time. Maybe you can teach me a thing or two about eating healthy
Her:
No you're ugly I'd love to, you sexy beast.