Charging port flap gets stuck

Rex 2017 - this is now the second time my charging port is getting slow and stuck in the colder weather. The first time it started happening regularly, I paid to repair it which was really expensive - they had to take off the side, etc.

It started happening again. The hook doesn’t want to release after I push the flap to open. Can I just WD-40 it or is there something I can do to avoid having to pay a lot to fix this problem?