Why is it so hard to try to ask someone out at their work place?

Like people ask people out or flirt at their job when they’re out like at restaurants, stores. etc like some people do it but I don't know how they do it, it looks impossible cuz they’re working so why would they bother talking to you about anything other than Being customer service? Explain Plss
Why is it so hard to try to ask someone out at their work place?
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