Theyu2019re people, and they *can* do whatever they want, but as a former manager at Starbucks, I *always* advised my partners not to, for their own safety and just because these customers already knew where they worked, etc, and if things go south, itu2019s kind of tough and awkward.If you really want to ask her out and think she may be interested, you could leave your number for her. Be understanding about it if you do though, and let her know itu2019s completely cool if sheu2019s not interested/never calls. Because youu2019re a customer, sheu2019s in a weird situation where she may feel very uncomfortable and cornered. Thereu2019s a power dynamic where when your apron is on, youu2019re friendly and outgoing, and customers are customers, and itu2019s often very hard to deal with advances that are unwanted in this mode. She may feel guilty and pressured into agreeing to hang out or go out, even if she doesnu2019t really want to.So if you do move forward with this, Iu2019d ask you to please be thoughtful, gracious, and really sympathetic to it being a tough situation for her, and *please* take any kind of hint of u201cno thank youu201d graciously and well.