GOAL GF thumb-latch decorative lock, door knob does not move

"door knob stuck"

When I checked the actual product at the site, it was a GOAL thumb-latch lock. The room side is compatible with door knobs.

There was something white on the outside, probably due to salt damage. Is it affected by salt damage to the inside?

I disassembled it and confirmed that there was no damage, but it seemed to be no problem. Be careful with this type of disassembly as the spring will pop out. This time, as a minimum disassembly, we were able to improve by greasing up.