Walkspeed Script HELP?

I need help with a script that when a player joins their walkspeed is set to 0 while the clicked.Value = false, here's my current script. Please help.

game.Players.PlayerAdded:connect(function(player)
    player.CharacterAdded:connect(function(character)
        while script.Parent.Clicked.Value==false do
            character.Humanoid.Walkspeed=0
        end
    end)
end)