Endless Runner-3 lanes

This may be the wrong place to put it but does anyone know how to make it so your character runs forever, but on the press of a key will switch the lane it is running in, for example in Minion Rush where you only have 3 lanes to move in. Also would this need to be a character or a pawn?

  1. Character
  2. There are nodes for keyboard input

For example:

Yes, I understand there are keys for keyboard inputs but how would I accomplish it moving to the left lane or right lane?