How to make a Key Door in Roblox Studio

local part = script.Parent
local isOpen = false

part.Touched:Connect(function(hit)
    local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
    local key = plr and plr.Character:FindFirstChild("Key")

    if key and not isOpen then
        isOpen = true
        part.Transparency, part.CanCollide = 0.5, false
        wait(2.5)
        part.Transparency, part.CanCollide = 0, true
        isOpen = false
    end
end)