Hey, I was just wondering how to make an if statement for physical properties, like the part material or color.
if script.Parent.Parent.Door.Material == "Neon" then script.Parent.Material = "Neon" end
Material values are Enums, not strings. You should check the Enum. You can still set the value with a string for convenience, though.
if script.Parent.Parent.Door.Material == Enum.Material.Neon then script.Parent.Material = "Neon" end