U-lock won’t open

It is decathlon D920L lock. Used it normally until now (for like two weeks since the friend gave it to me). Now suddenly I cannot open it: the key goes in and turns 90 degrees but nothing happens. I don't remember for sure if the key was supposed to turn more than 90 degrees, but I think yes. I put WD-40 in the keyhole and where the U part meets the shackle, tried hitting and twisting the lock various ways, but it's not opening. It looks like one side of the U part (right) is a bit more inside than the other and won't budge. On the other hand, the left side seems like it can move a tiny bit up and down. Not sure how relevant that is