I've done that before to get in to the server room during an outage in the middle of the night. For some reason my keycard wasn't working. Servers were on batte

I've done that before to get in to the server room during an outage in the middle of the night. For some reason my keycard wasn't working. Servers were on battery backup but the door locks weren't. Killed power via the master switch to the building long enough to get in the door, fix the outage and get out.