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Some of them get a bit stiff to open the blade.
my first one was like that, there is a couple options to help fix that....

you can remove the blade and sand paper the blade grove to ease the fit....

Ive had an Opinel carbon steel #8 in my pocket for about 6 years and i use it daily.

I broke my blade using it as a bit of a lever.... I know better, but was in a bind and pushed it just a little...