MIWA BMS, Repair of toilet lock that opens by the wind

"Even if you lock it, the wind will open it by itself."

It was an old apartment toilet. Even if it is locked, the door will open by itself due to the wind.

MIWA BMS Toilet locks and bathroom locks. There seems to be no problem with the main body, but when I look at the latch, it seems that it is not in strike. Is it because the door is warped? You need to fix your strike position.

I decided to correct the carving with a chisel and move the position of the strike forward.