Double click instead of one click?

Have a bool which keeps track of if the player clicked previously in the past two seconds:

playerClicked = false

function clicked()
	-- if this is the first time the players clicked, start the countdown 
	if(not playerClicked)then 
		playerClicked = true --set the player clicked state to be true
		wait(2)	-- give the player two seconds to click again
		-- if they don't click in the next two seconds, reset playerClicked to false
		playerClicked = false
	else -- the player clicked twice in the span of two seconds, do the following code you wanted them to do when they clicked twice
		local S = script.Parent.Parent.Parent.ScreenGui.Shop
	        S:TweenPosition(UDim2.new(0.272, 0,0.279, 0))
	    	script.Parent.Parent.Parent.ScreenGui.Shop.Visible = true
	end
end
script.Parent.MouseButton1Click:Connect(clicked)