Knife Folding

Does a folding knife lock prevent the blade from coming out or in?

Does a folding knife lock prevent the blade from coming out when it’s folded or from coming in when its out? Or both?
Btw I’m not talking about those multi-tools or swiss army knives
I’m just asking because I’m going on a camping trip and my organization requires a folding knife that has a lock.
I have a folding knife but it only locks when it’s out (I think). Does that count?

it prevents it from closing on u. if the knife is in good condition it shud not open by itself.

Ontario RAT 1 Folding Tactical knife: “Value Perfected” by Nutnfancy