You must make it to 6 AM as you fend off these monsters by using your hallway lights and security doors. However, you only have a limited amount of power due to budget cuts. Using the cameras, turning on the hallway lights, or shutting the security doors drains your power faster. If you run out of power, you will have nothing to defend yourself with. Use the button on each side of the security room to turn on the lights and open and close the security doors.
cred to SFX_fox