In one of the previous buildings my company was located in, the server room had a raised floor, and an electronic lock + keypad for the server room.
Easy to bypass as the latch was visible from outside the server room. You just need a screwdriver.
If that fails, the false ceiling will also allow you access, and so will the false floor.
The wall was drywall, not brick.
sheesh.
Nowadays in the current building both server room have proper safe doors (thick steel, heavy bigjobs. No raised floors or false ceilings either.
Although we got bitten by flooding in the front server room once - luckily it never happened again as we took precautions after that one time.
And no, the servers are not in a basement either.
The only weak link is the brick wall - all you'll need is a sledgehammer and some qualitay alone time.