Unity: Camera Shake

using UnityEngine;
using System.Collections;

public class ShakeCamera : MonoBehaviour
{

    public static ShakeCamera Instance;
    public float time = 0.1f;
    public float amp = 0.25f;

    private bool shaking;
    private Vector3 pos;

    void Start ()
    {
        Instance = this;
        pos = transform.localPosition;
    }

    void Update ()
    {
        if(shaking)
        {
            transform.localPosition = pos + Random.insideUnitSphere * amp;
        }
    }

    public void Shake(float Time, float Amp)
    {
        time = Time;
        amp = Amp;
        shaking = true;
        Invoke("Stop", time);
    }

    void Stop()
    {
        shaking = false;
        transform.localPosition = pos;
    }
}