Trying To make a Developer Product Door What's Wrong?

What is wrong with my Script! I don't want to use Data Stores Because none of the data needs saved.

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local buyButton = game.Workspace.BuyButton.SurfaceGui.TextButton
local productId = 22847136

buyButton.MouseButton1Click:connect(function()
    game:GetService("MarketplaceService"):PromptProductPurchase(game.Players.LocalPlayer, productId)
end)
local MarketplaceService = Game:GetService("MarketplaceService")
local productId = 22847136

MarketplaceService.ProcessReceipt = function(receiptInfo) 


    for i, player in ipairs(game.Players:GetChildren()) do
        if player.userId == receiptInfo.PlayerId then



            if receiptInfo.ProductId == productId then


                workspace.TheDoorToHall1.Transparency = 0.25
                workspace.TheDoorToHall1.CanCollide = nil

            end
        end
    end 


    return Enum.ProductPurchaseDecision.PurchaseGranted     
end