Could someone please explain the problems with my kill brick?

I've been trying to learn more scripting and practice more often. My friend created a game and asked me to help, and he let me script (Its an obby game btw) I have been trying to make a brick that will at a random moment turn Neon and kill the player. This is the script I created and am confused why it isn't working, I really only need a little guidance on what I should fix and how to fix it.

Also, if I would need separate scripts for it tell me, but it would be nice if there were a way to avoid that

The script:

local noTrust = script.Parent
while true do
	wait(math.random(3,5))
	noTrust.Material = "Neon"
	noTrust.Touched:Connect(function(hit)
		local human = hit.Parent:FindFirstChild("Huamnoid")
		if human ~= nil then
			human.Health = human.Health - 100
		else
			wait(math.random(3,5))
			noTrust.Material = "Plastic"
		end
	end)
end

Material is an Enum. You also spelt Humanoid wrong. Here is the fixed script:

local noTrust = script.Parent
while true do
	wait(math.random(3,5))
	noTrust.Material = Enum.Material.Neon
	noTrust.Touched:Connect(function(hit)
		local human = hit.Parent:FindFirstChild("Humanoid")
		if human then
			human.Health = 0
		else
			wait(math.random(3,5))
			noTrust.Material = Enum.Material.Plastic
		end
	end)
end

Don't forget to accept the answer if I helped!