The door was locked.
Obama was provided, by the USSS, with a master key that opened it.
Giving the benefit of the doubt on everything else, it’s still creepy as hell that Obama felt entitled to use a special key to just walk into an employee’s room.
They cut out the bit where obola was hysterically screeching in the hallway,"Reggie, you bitch! I know you've got someone in there with you!" THEN he got the key from the secret service.