"make me a keycard system for a hotel, please include instructions"

-- server script (ServerScriptService) 
local keycards = {} -- store keycards and their owners

game.Players.PlayerAdded:Connect(function(player)
    player.CharacterAdded:Connect(function(character)
        local keycard = Instance.new("Part")
        keycard.Name = "Keycard"
        keycard.Size = Vector3.new(1, 2, 0.1)
        keycard.BrickColor = BrickColor.new("Bright blue")
        keycard.Parent = character
        keycard.CFrame = character.HumanoidRootPart.CFrame * CFrame.new(0, 0, -3)
        keycards[keycard] = player.UserId
    end)
end)

-- script for hotel door 
local door = script.Parent
local isOpen = false

local function openDoor(keycard)
    if keycards[keycard] then
        if not isOpen then
            isOpen = true
            door.Transparency = 0.5
            door.CanCollide = false
            wait(5)
            door.Transparency = 0
            door.CanCollide = true
            isOpen = false
        end
    end
end

door.Touched:Connect(openDoor)

-- Instructions for the keycard system in Roblox:
1. Place the server script in ServerScriptService.
2. Place the hotel door script in the door part of the hotel room.
3. When a player joins the game, a keycard will be created and assigned to them.
4. When the player touches the door with their keycard, the door will open for 5 seconds and then close.
5. The keycard system is now set up and ready to use in your hotel game.