So many girls at work...what to do?

Alright so I work at Kroger and im a bagger most of the time and I see so many cute girls as I'm bagging groceries I want to approach them but I can't just leave out of the blue because I'm being supervised and it's making me crazy like today I was bagging and I look at this pretty girl and she's just looking me up and down with a smile like "I want you right now" it drove me nuts so what's a good way to get to talk to them?