How to make a GUI disappear when stop touching a part?

I had never used a TouchEnded before,so I need a script,not a hint.My problem is idk how to make a gui appear when touch a part.I have scripts when touch a part the gui will appear:

in the replicatedStorage ther is a remote event

a script in SeverScriptService:

 game.Workspace.Shop.Touched:Connect(function(hit)
     if game.Players:GetPlayerFromCharacter(hit.Parent)then
         game.ReplicatedStorage.RemoteEvent:FireClient(game.Players:GetPlayerFromCharacter(hit.Parent))
     end
 end)

and a script in the gui:

 game.ReplicatedStorage.RemoteEvent.OnClientEvent:Connect(function()
     script.Parent.Main.Visible = not script.Parent.Main.Visible
     end)