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Looks like the part of the cable broke. You need a new cable.
I think more than that is broke. The plastic on the lock itself looks broke too. What does the seat itself latch on to? Do you have a picture of a working one?
I cant take a pic to help because i have a banana seat version but the problems I had with mine included the plastic that goes around the hook and is part of the seat started to separate from the metal hook, I had to glue and zip tie it overnight for the glue to harden and work. Otherwise I also had the latch itself just kinda fall apart and had to rebuild it. Microfishe from somewhere like motorsport.com will help you figure it out.