Here are a few photos.
In this picture you can see the "Guard" I was talking about previously.

A close-up of the lock before the drilling. The hall was too dark and I had no tripod so I had to use the flash, hence the over exposure in these pics.

A close-up of the lock after drilling, at this point I was not sure what to do to open the lock; I tried using a spade screw driver to twist it and had no luck. I ended up thinking that I had to drill it a bit more... as soon as I put the drill bit in and started drilling the bit got stuck and the force of the sticking bit opened the lock.

The end result, plus an open locker.

Thanks for the help guys.