In a script in the invisible part in front of the wall or door

local part = script.Parent

local wall = game.Workspace.Wall

local canOpen = true

local function lift(otherPart)

local partParent = otherPart.Parent

local humanoid = partParent:FindFirstChildWhichIsA("Humanoid")

if humanoid and canOpen then

local player = game.Players:FindFirstChild(partParent.Name)

local gold = player.leaderstats.Gold.Value

if player and gold > 100 then

canOpen = false

player.leaderstats.Gold.Value = player.leaderstats.Gold.Value - 100

wall.Transparency = 1

wall.CanCollide = false

wait(2)

wall.Transparency = 0

wall.CanCollide = true

canOpen = true

end

end

end

part.Touched:Connect(lift)