Player.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SocialPlatforms;
using UnityEngine.XR;

public class Player : MonoBehaviour
{
    public GameObject boxPrefab;
    public GameObject ballPrefab;
    public GameObject bombPrefab;
    public Transform Hand;
    public float throwForce;
    public Camera camera;
    public LayerMask layerMask;
    public float maxDistance;
    public GameObject objInHand;

    public float grabDistance;
    public float attractionForce;

    // Start is called before the first frame update
    void Start()
    {
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.R))
        {
            GameObject box = Instantiate(boxPrefab, Hand.position, Quaternion.identity);
            box.GetComponent<Rigidbody>().AddForce(camera.transform.forward * throwForce, ForceMode.Impulse);
        }

        if (Input.GetKeyDown(KeyCode.T))
        {
            GameObject ball = Instantiate(ballPrefab, Hand.position, Quaternion.identity);
            ball.GetComponent<Rigidbody>().AddForce(camera.transform.forward * throwForce, ForceMode.Impulse);
        }

        if (Input.GetKey(KeyCode.Mouse1) && objInHand == null)
        {
            Ray ray = new Ray(camera.transform.position, camera.transform.forward);

            //Just for helping
            Debug.DrawLine(ray.origin, ray.GetPoint(maxDistance));

            RaycastHit hit;
            if (Physics.Raycast(ray, out hit, maxDistance, layerMask))
            {
                if (Vector3.Distance(Hand.position, hit.transform.position) < grabDistance)
                {
                    objInHand = hit.transform.gameObject;
                    objInHand.transform.position = Hand.position;
                    objInHand.GetComponent<Rigidbody>().isKinematic = true;
                    objInHand.transform.parent = Hand;
                }
                else
                {
                    Vector3 dir = Vector3.Normalize(Hand.position - hit.transform.position);
                    hit.transform.GetComponent<Rigidbody>().AddForce(dir * attractionForce * Time.deltaTime, ForceMode.Impulse);
                }
                
            }
        }

        if (Input.GetKeyDown(KeyCode.Mouse0))
        {
            if (objInHand != null)
            {
                objInHand.GetComponent<Rigidbody>().isKinematic = false;
                objInHand.transform.parent = null;
                objInHand.GetComponent<Rigidbody>().AddForce(camera.transform.forward * throwForce, ForceMode.Impulse);

                objInHand = null;
            }
            else
            {
                objInHand = Instantiate(bombPrefab, Hand.position, Quaternion.identity);
                objInHand.GetComponent<Rigidbody>().AddForce(camera.transform.forward * throwForce, ForceMode.Impulse);
            }
        }

        if (Input.GetKeyDown(KeyCode.H))
        {
            if (Time.timeScale == 1)
            {
                Time.timeScale = 0.5f;
            }
            else
            {
                Time.timeScale = 1f;
            }
        }
    }
}