Help with Camera.Subject and Camera.Type?

I made a Camera Script to where it spins around a part when you join. But I made this script that is below to when you press a gui button, the camera will be on your characters head. Does not work though. It stays spinning on the part.

script.Parent.MouseButton1Click:connect(function()
    local Player = game.Players.LocalPlayer
    local Char = Player.Character
    local Camera = game:GetService("Workspace").CurrentCamera   
    while wait() do

        if script.Parent.Parent.TextBox.Text == "a123" then
            Camera.CameraSubject = Char:WaitForChild("Head")
            Camera.CameraType = "Attach"
        elseif script.Parent.Parent.TextBox.Text ~= "a123" then
            Player:Kick("The code you have entered is wrong.")
        end
    end

end)