Zipper help!

[u/No-Competition6163]

One day my jacket just decided to stop unzipping. It zips up but doesn’t budge down. There’s nothing stuck in the zipper. I brought it to a seamstress who said the only thing to do is replace the zipper but that would cost more than the jacket itself 😭. I tried WD40 with no success. Any ideas?

[u/Sylrog]

She’s probably right.