That's how hospital outpatient clinics are like in older hospitals in my country. Wooden doors with a little window each open up to a waiting room with rows of chairs. Display with queue number and the room you're supposed to go to nearby. So everyone sees which room you go into (they chime you in and the display flashes with the buzzer sound) and which room you exit.

The modern ones are similar but the waiting room door is large sliding glass doors opening into long corridors with the wooden doors with windows branching off the corridor. Same thing with the display and being buzzed in.