Roblox Script Generated by ScripterAI

"make a shop GUI where you step on a part and it opens it using clean tweening, once you are off the part, the GUI closes through tweening, also tell me how to set it up."

-- server script 
local part = game.Workspace.Part
local tweenService = game:GetService("TweenService")
local tweenInfo = TweenInfo.new(1, Enum.EasingStyle.Quad, Enum.EasingDirection.Out, 0, false, 0)

local function openGui(player)
	local gui = player.PlayerGui:WaitForChild("ShopGui")
	local frame = gui.Frame
	local tween = tweenService:Create(frame, tweenInfo, {Position = UDim2.new(0.5, 0, 0.5, 0)})
	tween:Play()
end

local function closeGui(player)
	local gui = player.PlayerGui:WaitForChild("ShopGui")
	local frame = gui.Frame
	local tween = tweenService:Create(frame, tweenInfo, {Position = UDim2.new(0.5, 0, -0.5, 0)})
	tween:Play()
end

part.Touched:Connect(function(hit)
	local player = game.Players:GetPlayerFromCharacter(hit.Parent)
	if player then
		openGui(player)
	end
end)

part.TouchEnded:Connect(function(hit)
	local player = game.Players:GetPlayerFromCharacter(hit.Parent)
	if player then
		closeGui(player)
	end
end)

-- To set this up in Roblox, follow these steps:
1. Create a part in Workspace and name it "Part".
2. Create a ScreenGui inside StarterGui and name it "ShopGui".
3. Inside "ShopGui", create a Frame and set its Position to UDim2.new(0.5, 0, -0.5, 0).
4. Paste this script inside a Script in ServerScriptService.
5. Play the game and step on the part to see the GUI open and close.