We simply called them attendants or service station "jockeys" apparently (I wouldn't know first hand because I was raised in another country and by the 70s when I'd visit the US every year, self service was becoming the norm), and the service station was also called a "filling station" toward the early 20th century.
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I feel we're going down the rabbit hole
talking of the 1970s, here's another mall staple: Hickory Farms. Luckily this one has not disappeared yet, let's just say they have no presence in malls any longer, because malls in the US are practically gone. Their presence is much reduced in the United States and now limited to brick and mortar shops and online sales.
A company from Ohio, Hickory Farms dealt in gourmet sausages, cheeses, fruit preserves and candy products meant to be sold as gifts or consumed at parties. Requiring no refrigeration meant they could mail their products and have shops anywhere, from a kiosk to a vending cart, or a full shop at the mall. Their food products were marketed as "American farm traditional," and were mostly German, Czech and Dutch immigrant foods from the US "Midwest."
At a time when "Little House on the Prarie" was a popular TV show, it was not unusual for them to have a young female employee dressed like an American pioneer girl, or some grandfatherly gentleman handing out samples to the public walking at the mall.
A situation which was hilariously alluded to by "That Seventies Show"
