Boomerang weapon?

Hello, I'm new to unity and am trying to make a boomerang, I currently have this code. But what would I do to add a keypress so the boomerang is thrown on a keypress? Thanks

  public float speed = 1f; // default speed 1 unit / second
  public float distance = 5f; // default distance 5 units
  public Transform boomerang; // the object you want to throw (assign from the scene)
  private float _distance; // the distance it moves
  private bool _back; // is it coming back
  
  public void Shoot ()
  {
      _distance = 0; // resetting the distance
      back = false; // resetting direction
      enabled = true; // enabling the component, so turning the Update call on
  }
  
  private void Update ()
  {
      float travel = Time.deltaTime * speed;
      if (!back)
      {
          boomerang.Translate(Vector3.forward * travel); // moves object
          _distance += travel; // update distance
          back = _distance >= distance; // goes back if distance reached
      }
      else
      {
          boomerang.Translate(Vector3.forward * -travel); // moves object
          _distance -= travel; // update distance;
          enabled = _distance > 0; // turning off when done
      }
  }
  
  private void OnEnable ()
  {
      boomerang.gameObject.SetActive (true); // activating the object
  }
  private void OnDisable ()
  {
      boomerang.gameObject.SetActive (false);
  }