This is not a force play, so the runner would have to be tagged to be Out.
Lead runner has the right to the bag as long as they are not being forced ahead by occupants of other bases. If the runner on 3rd was not being forced they can return to the bag and the runner from 2nd must return to 2nd. The runner returning to second if tagged is out and unless the runner returning to 3rd is tagged while off the base then they are safe. If both runner attempt to occupy the base at the same time and fielder tags both runners while they occupy the base the runner from 2nd is out unless they are being forced ahead then the runner from 3rd is out.
If the runner gets tagged, then he is out. If the base doesn't get stepped on or the runner gets tagged, then he is safe.
If the runner touches second base frist, then yes. He would the technically be on his way to third base, and no longer forced. If he has yet to touch second, then no. He would still be on his way to second and therefore "forced". He can be tagged or you could just step on second.
I will assume you mean when a batter has hit a ground ball to an infielder and the throw to first pulls the first baseman off the bag. On any force play, and the above would be considered a force play since the batter is forced to run when (s)he hits the ball, the batter would be called out because it is only necessary to have full possession of the ball and touch the base before the runner does.
the only way for them to get out is if there tagged so yes