How to set this to GetButton?

 private void UpdateControls() {
     if (Input.GetKey (leftKey)) { //I want remove all GetKey's, and paste there GetButtom
         FaceDirection (-1);
     } else if (Input.GetKey (rightKey)) {
         FaceDirection (1);
     } else {
         FaceDirection (0);
     }

     if (Input.GetKeyDown (jumpKey)) {
         Jump ();
     }
 }