// This is a simple explanation of the logic.
// In UEFN, you mostly use the visual device connections,
// but here is how the code thinks:

// 1. The Game checks the player's inventory.
if (Player.HasItem(Jewel)) {
    // 2. If the player has the Jewel...
    Door.Open();
    // 3. ...then open the door!
} else {
    // 4. If the player does NOT have the Jewel...
    Door.Lock();
    // 5. ...keep the door locked.
}