tried to do script that activates himself when player touches another block but Script Not Working?

wait(0.5)
repeat wait() until game.Workspace:FindFirstChild("Trigger") == nil
while true do
	wait(1)
	for i = 1, 70 do
		script.Parent.CFrame = script.Parent.CFrame * CFrame.new(0, 0, 0.3)
		wait(0.001)
	end
	wait(4)
	for i = 1, 70 do
		script.Parent.CFrame = script.Parent.CFrame * CFrame.new(0, 0, -0.3)
		wait(0.001)


	end
end