Camera shake on touch for some time ?

How can I make script that shakes the player's screen after he touches a specific part for some time like 5 secconds ?

This should work

local speed = 1 --speed of shaking

for i = 1, (30*speed) do
	local x = math.random(-100,100)/100
	local y = math.random(-100,100)/100
	local z = math.random(-100,100)/100
	game.Players.LocalPlayer.Character.Humanoid.CameraOffset = Vector3.new(x,y,z)
	wait(1*10^(speed*(-1))
end

something like that, the math is probably wrong.