blocking then passing through walls

[radiant quest]

hi, I need help on making an invisible wall that at the start of the game disables you from accesing whats on the other side but later disappears so the player can go through. Like you walk over a part to destroy the wall or something?

[analog belfry]

local part = workspace.Part
local wall = workspace.Wall

part.Touched:Connect(function(k)
    if k.Parent:FindFirstChild("Humanoid") then
        wall:Destroy()
    end
end)