I'm trying to imagine doing anything that would make the lock fail. I think the blade would snap first, unless your locking ring is loose and has rotated round to the 'unlocked' position.
I suspect you're right about it actually failing. Mine certainly isn't difficult to turn (and certainly isn't radically different to the other Opinels I've used, as I recall), but the way that I rest my index finger is what seems to rotate it. Might just be me, I guess.
It's a decent locking mechanism, admittedly. I think friction folding is a better idea, but then again the no. 8 wouldn't be my choice of EDC anyway even if it were legal.