explode function not work in script. Which Should I do?

I was creating easy bank robbery and scripted safe model and script was correcting tnts but "explode" function didn't work and i was fixing it, I was sweating as hell that script failed. There is a code:

local tnt = game.Lighting.TNT:Clone()
local tnt2 = game.Lighting.TNT2:Clone()
local explode = Instance.new("Explosion")
explode.BlastPressure = 5000000
explode.BlastRadius = 4
explode.DestroyJointRadiusPercent = 0
explode.Parent = script.Parent

function ontouch()
	tnt.Parent = workspace
	wait(10)
	tnt2.Parent = workspace
	wait(10)
	explode.Position = workspace.Safe.Head
	explode.Visible = true
	script.Parent.Transparency = 1
	script.Parent.CanCollide = false
end

script.Parent.Touched:Connect(ontouch)