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.
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 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