A man was talking to a woman. They were in a room somewhere at the back of a shop. The man wanted somebody to bring them coffe so he:

opened another door, towards the rear of the
premises; and spoke to someone invisible, telling it to pop
next door and bring coffee for two, ‘in a pot,mind, none of
their sloppy cups. And a plate of macaroons.’

Does it mean that that door led to the backyard?