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You will need to buy a new lock and get it fitted, that I'm afraid is the only sensible answer....

If you can find a locksmith - there should be plenty about (or even a joiner, they seem to fix these things) it is probably just some adjustment needed to the lock fixing to make the same key turn like it did when it was new. Have a look yourself and see if any screws have come loose (ones which you might be able to see from the inside, either around the lock or at the places where the bars enter the frame) and tighten them up a bit. Even that might solve the problem! Don't try to force the key though, that could get expensive.

We had a similar case a couple of years ago. Called the locksmith who was able to fix it. Expensive "visit" but less expensive and messy than having to change the lock.

Hi everyone! Thank you for the advice.  It's been crazy trying to get a locksmith to come out. An 'emergency' visit costs 200 euro!! So we've been patiently waiting for an appointment. Really hoping that it's possible to remove the key and use the same lock. As far as I can see, there are no loose screws or broken parts.  We have a double lock that needs to be turned twice and it seems like the key was stuck mid-turn, so now it's in there "upside down."

Great to hear that your problem is solved. It was better to have the locksmith hitting the lock as he knows what he is doing. An expensive visit, perhaps it is cheaper to ring a brain surgeon