it obviosly has a combination to it, if you cant remember the combination the only other way to open it would be to try and break into it
You can hire a consultant for this kind of thing, as if the safe is any good, it's going to be impossible for somebody to just randomly break open.
It depends on what sort of safe, and how 'safe' it is. If it is a cheap one, you could probably smash it open if you have forgotten the combination. If it was very expensive, then most likely a very good quality safe, you will have some trouble lol. Some safes are even fire proof. Maybe a lock picker could do it for you.