Should I flirt with her or something? I'm kinda shy...?

Well, there's this girl who works at Subway. She's really cute and has a great personality. Anyway, I'm wondering if I should flirt with her or ask her out. I'm really shy when it comes to people I like and not only that, asking someone out at Subway is kinda weird. What should I do? She's butch, by the way, I'm femme for the most part. Also, I think she may be TG, because her nametag says Mason...? Anyway, what do you all think?