Le sigh.
If the key won't turn the barrel, then either they don't go together, or the mechanisms in the doors are jammed. The first is 1000000% more likely than that both doors have f**ked up in the same way. Nevertheless, you could take the door cards off, and check out the locking rods, clips, pivots and so on and spray some lithium grease on them and see what's happening. In fact, if you take the cards off and then use the internal lock mechanisms (near the inner door handle) you should be able to see if the only possible thing that could be wrong is that the lock barrels won't turn.
Then you get a locksmith.
And FFS. You've had the car 2 years and haven't attempted to get a spare key?!!!