Re: @Prst. V.Jeltz
It's not about having English [...], it's about having enough knowledge to interact with customers (who, by the way, may also not speak English that well so you'd have TWO language barriers to cross)
I was in a fast food outlet one Friday evening in a major UK city. The person behind the counter and the customer both clearly were not native English speakers and could only just get by in English. It took about ten minutes for the (simple!) order to be placed.
(Many years later, I still feel a pang of guilt that I never stepped in to help clear up the confusion)