How would I change the camera of an individual player for a while AFTER they have spawned?

How would I change the camera of an individual player for a while AFTER they have spawned?

I have tried to do this with scripts that change the camera-properties, but I have failed to succeed with my goal.

Is there a way to do this, if so: How would I do it?

Please Note: I am not asking for any one to make the script for me, all I really want to know is how I would do it.

By "a while after they have spawned" I mean for a duration of time after they have spawned the FIRST TIME, like not after they reset, but when they are added.

Any help is greatly appreciated!

try doing this

game.Players.PlayerAdded:connect(function(player)
	game:GetService('Players').LocalPlayer.CameraMode = Enum.CameraMode.LockFirstPerson
end)