Who closes the door when the bus driver gets off?
The doors have a setting where they can be manually opened/closed. So when the driver parks at the end of their shift, they just close them and lock them like any other vehicle.
The bus is magical and it can close its doors by itself, in fact the bus driver is a robot
The ghost he lets on at railroad tracks, of course!
There is a button on the side of the door where it can be opened and closed from the outside of the bus.... Oops should I be telling you this?