Welcome. http://youtu.be/DlRfLy6f7sI Found this video. Looks like its picks pretty easy. Someone here is bound to know what key blank fits your safe. A photo of the lock(key-way) will be helpful. There might be a number stamped on it.
Also doing some reading on google. your safe may be related to Honeywell 2054 model. which you can find a manual containing contact numbers to get a key made. Brinks most likely has the same service.