How come the print() is printing but Instance.new() isn't creating a new part?

##=PROBLEM=## So I'm trying to make this magic kind of game and I created a local script inside *StarterCharacterScripts* but when I tested it everything printed but the part isn't being created.

##=My Script/Code=## Here;

local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()
local characterLL = plr.CharacterAdded:Wait():WaitForChild('Left Leg')

mouse.KeyDown:Connect(function(K)
	if K == 'z' then
		local NewIce = Instance.new("Part")
		NewIce.Size = Vector3.new(10,0.2,10)
		NewIce.Name = 'Ice'
		NewIce.Anchored = true
		NewIce.CanCollide = false
		NewIce.Material = 'Ice'
		NewIce.BrickColor = BrickColor.new('Pastel light blue')
		NewIce.TopSurface = 'Smooth'
		NewIce.BottomSurface = 'Smooth'
		NewIce.Position = Vector3.new(characterLL.Position)
		print("complete")
	end
end)

So basically it printed complete but I can't see the NewIce, what's my problem? How can I fix it? Any feedback/help is appreciated. Thanks