issue

using UnityEngine;
using System.Collections;

public class MinimapCamera : MonoBehaviour {

	public static int zoomLevel; //zoom level
	public static MinimapCamera Instance; //declare this to global script


	//Private variable
	private int zoomCurrent;

	[HideInInspector]
	public Transform Target;

	void Start()
	{
		//Setting Default Value
		zoomLevel = 3;
		zoomCurrent = zoomLevel;
		Instance = this;
		GameObject hero;
		hero = GameObject.FindGameObjectWithTag("Player");
		Target = hero.GetComponent<Transform>();
	}

	// Update is called once per frame
	void Update () {

		//Follow player
		transform.position = new Vector3(Target.position.x,transform.position.y,Target.position.z);
		ZoomManage ();

	}

	void ZoomManage ()
	{
		//Check zoom limit
		if(zoomLevel < 0)
		{
			zoomLevel = 0;
		}else if(zoomLevel > 4)
		{
			zoomLevel = 4;
		}
	}

	public void ZoomUpdate()
	{
		if(zoomLevel < zoomCurrent)
		{
			this.GetComponent<Camera>().orthographicSize += 3;
			zoomCurrent = zoomLevel;
		}else

		if(zoomLevel > zoomCurrent)
		{
			this.GetComponent<Camera>().orthographicSize -= 3;
			zoomCurrent = zoomLevel;
		}
	}
}