i couldnt make my object jump.,i couldn't make my object jump

when player doubletap on screen i want my object jump. i tried 3 different code but object doesnt jump. Is anyone can tell me why? I wrote code in lateupdate. i put debug.log and its working in same place.

     if (Input.touchCount == 1 && Input.GetTouch(0).phase == TouchPhase.Began)
     {
         tapCount++;
     }
     if (tapCount > 0)
     {
         doubleTapTimer += Time.deltaTime;
     }
     if (tapCount >= 2)
     {

         //rb.velocity = Vector3.up * force;
         //rb.AddForce(transform.up * force);
         rb.AddForce(new Vector3(0, 5f, 0), ForceMode.VelocityChange);

         Debug.Log("doubletap successful");
         doubleTapTimer = 0.0f;
         tapCount = 0;
     }
     if (doubleTapTimer > 0.5f)
     {
         doubleTapTimer = 0f;
         tapCount = 0;
     }