why is the tool not working

made a tool that'll change your walkspeed when activated then itll change it back after a little while, not sure why its not working

Debounce = false

tool = script.Parent

tool.Activated:Connect(function()

	local player = game.Players:FindFirstChild(tool.Parent.Name)
	if Debounce == false then
		Debounce = true
		player.Character.Humanoid.WalkSpeed = 40
		wait(15)
		player.Character.Humanoid.WalkSpeed = 23
		wait(7)
		Debounce = false
	end
end)