How do you successfully ask out a girl at work even though the work environment is fast paced?

I want to ask out a girl that I've been talking on and off to at work for the past couple of months, but due to the fast paced nature of the work we constantly have to be moving place to place. I only get to talk to her in person very few times per week, but each time I really savor and enjoy the conversations we have. The thing is, some of those conversations are put on hold due to other duties put on me by other co workers, causing me to go somewhere else to do said thing. I want to ask her out with no one around, but since this a minimum wage supermarket job, that is almost impossible to achieve. I can't access other peoples schedules, meaning I cannot know when she works next (should probably ask her when she works now that I think about it). I just want some one to one conversation without customers or co workers. Has anyone had a similar situation to mine? All I can find online is just techniques, but I just want ways to find time to talk to her and to hopefully ask her out without being weird or awkward. Also, the whole "dont dip your pen in company ink" thing, I dont care. This is a minimum wage job that can be replaced.

How do you successfully ask out a girl at work even though the work environment is fast paced?
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