See if the dark round button is engaged or can be ‘wiggled’
Then more detail as per @YetAnotherRainyDay linked
It might just be the picture but the lock looks wonky. Is it loose/has it moved ? In which case try to shift it back to level
Then ultimately what to do once you have it open.
Is it the only lock on the door? (Eg do you have a lever lock as well?)
If it isn’t the only lock then I would say to take off the lock, lock up with the other and deal with the problem lock - if it’s badly aligned then adjust that, if the lock itself is unreliable then I’d get a replacement from a hardware shop (or online with next day delivery if you can’t get to a shop)
If you were not moving and that’s the only lock then I’d recommend getting an extra lock fitted, so there are at least two points of failure and that the door would be harder to kick in
If you are unable to unlock it then attempts with a coat hanger etc may help, but are obviously meant to be hard to do, and ultimately brute force - eg prise the doorframe end of the lock
Try to minimize the force as you could be adding to expense to fix it up before moving
A clever Cloggs idea is to pop the hinge pins and release the other side of the door, but that’s not necessarily so simple