You are left with two options, either be night guard or one of the girls;

Night guard; 

you have no doors but you have 2 buttons on each side of your desk, those buttons will shock the area where they are, for example if you press the right button it will shock the right side of the room. 

One of the girls; 

Your job is to capture the night guard and store him away before it reaches 6AM. Once captured, goddess will put his/her soul inside a body thats one of them to make him/her one of them…