Asking out a barista?

[IHAVEQUESTIONS]

There's a really cute barista who works at the coffee shop I frequent each day before/after work.

The baristas come around and collect the coffee mugs if patrons don't return them to the front counter. I was thinking about leaving a note under my mug with my name (or twitter handle) and number. No pressure on her this way, especially given that it's her work environment.

Thoughts/advice?