Script for picking up objects in Unity.

PickUpObject.cs

using UnityEngine;
using System.Collections;

public class PickUpObject : MonoBehaviour {
	public Transform player;
	public float throwForce = 10;
	bool hasPlayer = false;
	bool beingCarried = false;
	
	void OnTriggerEnter(Collider other)
	{
		hasPlayer = true;
	}
	
	void OnTriggerExit(Collider other)
	{
		hasPlayer = false;
	}	
	
	void Update()
	{
		if(beingCarried)
		{
			if(Input.GetMouseButtonDown(0))
			{
				rigidbody.isKinematic = false;
				transform.parent = null;
				beingCarried = false;
				rigidbody.AddForce(player.forward * throwForce);
			}
		}
		else
		{
			if(Input.GetMouseButtonDown(0) && hasPlayer)
			{
				rigidbody.isKinematic = true;
				transform.parent = player;
				beingCarried = true;
			}
		}
	}
}

Guys this script for old unity versions so i did make that for new unity version. That Is The Code:
using UnityEngine;
using System.Collections;

public class PickUpObject : MonoBehaviour {
public Transform player;
public float throwForce = 10;
bool hasPlayer = false;
bool beingCarried = false;

void OnTriggerEnter(Collider other)
{
	hasPlayer = true;
}

void OnTriggerExit(Collider other)
{
	hasPlayer = false;
}	

void Update()
{
	if(beingCarried)
	{
		if(Input.GetMouseButtonDown(0))
		{
			GetComponent<Rigidbody>().isKinematic = false;
			transform.parent = null;
			beingCarried = false;
			GetComponent<Rigidbody>().AddForce(player.forward * throwForce);
		}
	}
	else
	{
		if(Input.GetMouseButtonDown(0) && hasPlayer)
		{
			GetComponent<Rigidbody>().isKinematic = true;
			transform.parent = player;
			beingCarried = true;
		}
	}
}

}

it does not work

set ur collider to is trigger or something idk