That station, located in Los Angeles, was rather a famous one -- it was a spinoff from the drive-in restaurant idea then becoming popular in Southern California. The pump lanes were monitored by carhops on roller skates, who would collect payment from customers, making change from the coin dispensers on their belts and then rolling back to the station office to ring up the sale.
The two ladies (girls?) in the picture look to be the attendants, though not on roller skates.