well..I'm stuck again on doors

[PutraenusAlivius]

void OnStart()
{
SetEntityCallbackFunc("KEYNAME", "FUNCTION");
}

void FUNCTION(string &in asEntity, string &in Type)
{
SetSwingDoorLocked("DOORNAME", false, false);
}

(NOTE: This is the script that you've mentioned -- which is making the door to unlock BEFORE you can use it. Although it's unlocked when you pick the key up.)

I'm still confused what do I change?:/

KEYNAME to your key's name.
FUNCTION to whatever is your function.
DOORNAME to your door's name.