How to make an tween gui open and close with the same button?

Im trying to open a shop with a button once the shop is open you can close it with that same button. I tried to attempt doing that but it didn't work; here is the script i used: i used this in a local script

local open = script.Parent.Parent.Open
open.Value = true

script.Parent.MouseButton1Click:Connect(function(click)
		script.Parent.Parent:TweenPosition(UDim2.new(-0.111, 0,0.211, 0),true)
		wait()
	script.Parent.Text = ">>"
	open.Value = false
end)

wait()

if open.Value == false then
	script.Parent.MouseButton1Click:Connect(function(click)
		open.Value = true
		script.Parent.Parent:TweenPosition(UDim2.new(0, 0,0.211, 0),true)
		wait()
		script.Parent.Text = "<<"
	end)	
end