How to Use Debounce With Multiple Players?

Okay, so heres my problem. Currently I a using a debounce function and it works great except that it only works when the first player touches it and not for any other player afterward. I need this script to work when any player touches it, but I only need it to happen once. Any help with this would be greatly appreciated. Here is the script:

local part = game.Workspace["Floor Brick Shop"] --gets the part
walkedon = 0

part.Script.Opens.OnServerEvent:Connect(function(player,HIT) --you mistaken Open as Touched in your script
    if walkedon == 0 then

        walkedon = 1   

 local h = HIT.Parent:FindFirstChild("Humanoid")
local player = game.Players:GetPlayerFromCharacter(HIT.Parent)
-- do this every time a new character for each player is created


local PlayerGuiServer = game.ServerStorage.Store -- Replace 'nil' with the location of your folder

for _, screenGui in pairs(PlayerGuiServer:GetChildren()) do
    screenGui:Clone().Parent = player.PlayerGui

end
    if h then
        player.PlayerGui.ShopGui.ShopFrame.Visible = true

    end
walkedon = 1
wait(0.9)
     end
end)