"Make A banning Gui that closes and opens and only appears on the owner"

-- local script (StarterGUI) 
local player = game.Players.LocalPlayer
local ownerId = 123456789 -- Replace this with the owner's UserId

if player.UserId == ownerId then
    local screenGui = Instance.new("ScreenGui", player.PlayerGui)

local banGui = Instance.new("Frame", screenGui)
    banGui.BackgroundColor3 = Color3.fromRGB(0, 0, 0)
    banGui.Size = UDim2.new(0, 300, 0, 200)
    banGui.Position = UDim2.new(0.5, -150, 0.5, -100)
    banGui.Visible = false

local openButton = Instance.new("TextButton", screenGui)
    openButton.Text = "Open Ban GUI"
    openButton.TextColor3 = Color3.fromRGB(255, 255, 255)
    openButton.BackgroundColor3 = Color3.fromRGB(0, 0, 0)
    openButton.Position = UDim2.new(0, 10, 0, 10)
    openButton.UICorner = 5

local closeButton = Instance.new("TextButton", banGui)
    closeButton.Text = "Close Ban GUI"
    closeButton.TextColor3 = Color3.fromRGB(255, 255, 255)
    closeButton.BackgroundColor3 = Color3.fromRGB(0, 0, 0)
    closeButton.Position = UDim2.new(0, 10, 0, 10)
    closeButton.UICorner = 5

openButton.MouseButton1Click:Connect(function()
        banGui.Visible = true
    end)

closeButton.MouseButton1Click:Connect(function()
        banGui.Visible = false
    end)
end