Instantiate object ahead of player

It's been asked before, but I'm new to C# and Unity. Used to matlab. Basically the game runs, but no object instantiates when I click.

     using UnityEngine;
     using System.Collections;
     public class Building : MonoBehaviour {
 public GameObject sphere1=null;

 // Use this for initialization
 void Start () {
     sphere1=Instantiate(Resources.Load("Prefabs/prefab_sphere")) as GameObject;
 }

 // Update is called once per frame
 void Update () {
     var playerObject = GameObject.Find("Player");
     var playerPos  = (Vector3)playerObject.transform.position;
     var buildingPos = playerPos + 10*Vector3.forward;
 
     Debug.Log(playerPos);
     if(Input.GetMouseButtonDown(0))
         sphere1=Instantiate(Resources.Load("Prefabs/prefab_sphere"),buildingPos,Quaternion.identity) as GameObject;
          

 }

}