void main()
{
    object oTarget;

    // Get the creature who triggered this event.
    object oPC = GetEnteringObject();

    // Only fire for (real) PCs.
    if ( !GetIsPC(oPC)  ||  GetIsDMPossessed(oPC) )
        return;

    // Only fire once per PC.
    if ( GetLocalInt(oPC, "DO_ONCE__" + GetTag(OBJECT_SELF)) )
        return;
    SetLocalInt(oPC, "DO_ONCE__" + GetTag(OBJECT_SELF), TRUE);

    // Close and lock "HUNEFER_DOOR".
    AssignCommand(oTarget, ActionCloseDoor(oTarget));
    SetLocked(oTarget, TRUE);

    // Setting the requirement for a specific key to unlock "HUNEFER_DOOR".
    SetLockKeyRequired(oTarget);
    SetLockKeyTag(oTarget, "HUNEFER_KEY");

    // Setting lock data for "HUNEFER_DOOR".
    SetLockLockable(oTarget, FALSE);
    SetLockUnlockDC(oTarget, 30);
}