How do i make a sound play for any given amount of time, then stop?

i've tried

function onPlayerEntered

Game.Workspace.Sound.Play()

wait(100)

Game.Workspace.Sound.Stop()

But it didn't work.

function onPlayerEntered()
Game.Workspace.Sound:Play()
wait(100)
Game.Workspace.Sound:Stop()
end

game.Players.PlayerAdded:connect(onPlayerEntered)

You had a few errors. I fixed them.