Why wont this work?

I made a script that on "f" pressed turns on SpotLight, the problem is when I use key == "f" it doesn't work and when I use key:byte() == 50 (etc.) it does.. Here's script

script.Parent.ChildAdded:connect(function()
	if mouse == nil then
		Player = game.Players.LocalPlayer
		mouse = Player:GetMouse()
	end
mouse.KeyDown:connect(function(key)
	

	local Left = script.Parent.Parent.Lights.FL.FLL
	local Right = script.Parent.Parent.Lights.FR.FRL
	key = key:lower()
		if key == "f" and Left.Enabled == false then
			Left.Enabled = true
			Right.Enabled = true
		if key == "f" and Left.Enabled == true then
			Left.Enabled = false
			Right.Enabled = false
		end
		end
end)
end)

May I ask what this script is in? Thank you. Please give me it's parents and the classname of (all) parent(s).

Yeah this is an Car, here you go with Parents

Car -VehicleSeat --Lights -Body -Lights --FL ---FLL --FR ---FRL

(Srri Im a bit confused with this site, Im new here)