Good news that you can still open it from the inside as this means you have better access to take the door card off which is what I think you will have to do. With the door card off you'll be able to inspect the mechanism. There's quite a lot of info on the forum on this topic as it seems like a common problem. Try searching the forum or even just Google.
It's been ages since it happened to me but once you've got the door card off and are looking in, from memory, there should be a metal rod going from the outer handle, into a white plastic clip which is clipped onto a metal arm on the door lock gizmo. I've always thought of this as looking a bit like a bottle opener. This all has to be connected up and crucially the rod has to be in the correct position within the white clip in order to function properly. The rod is threaded on the end where it goes into the clip but this doesn't mean it screws on or anything. The white clip opens up like a clam and is also threaded. It closes on the rod.
If your arms are nimble enough, reach in and push the bottle opener down by hand and see if it unlocks the door. If it does then you've confirmed the problem is your handle to rod to clip set up.
Apologies if any of this info is false. It has been some time. Good luck.
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