Key to a level door

[The chaser]

I have thought a workaround:

Make a script area that has the shape of the level door, and name it "AreaLevel". Now, go to the Area panel and search for Player Interact Callback. There, put "Touch" (without quotation marks)
You know you can use items (like keys) in ScriptAreas, right?

Put this in your script:

void OnStart()
{
SetLocalVarInt("Area_locked_level", 1);
SetEntityCallbackFunc("Key", "WhenPicked"); //Key must be the name of your key
}

void WhenPicked (string &in asEntity, string &in asType)
{
SetLocalVarInt("Area_locked_level", 0);
}

void Touch (string &in asEntity)
{
if (GetLocalVarInt("Area_locked_level") == 1)
{
SetMessage("Messages", "Msgname1", 0);
}
if (GetLocalVarInt("Area_locked_level") == 0)
{
SetLevelDoorLocked("Door_1", false);
SetEntityActive("AreaLevel", false);
}
}

The player won't have to use the key by itself, but I think it's a good workaround.