Coins Multiplier

I want to make a power up trigger where the trigger will multiply the coin by 2 if i collect the coins for 5 seconds. Below is my coin script.

using UnityEngine; using System.Collections;

public class CoinBehavior : MonoBehaviour {

 public int value;
 
 // Use this for initialization
 
 void OnTriggerEnter()
 {
     CoinManager.instance.Collect(value, gameObject);

     AudioSource source = GetComponent<AudioSource>();
     source.Play();
 }

}

And this is the coin manager script

using UnityEngine; using System.Collections; using UnityEngine.UI;

public class CoinManager : MonoBehaviour {

 public static CoinManager instance = null;

 public GameObject scoreTextObject;

 int score;
 Text scoreText;
 

 void Awake()
 {
     if (instance == null)
         instance = this;
     else if (instance != null)
         Destroy(gameObject);

     scoreText = scoreTextObject.GetComponent<Text>();
     scoreText.text = "Score: " + score.ToString();
 }

 public void Collect(int passedValue, GameObject passedObject)
 {
     passedObject.GetComponent<Renderer>().enabled = false;
     passedObject.GetComponent<Collider>().enabled = false;
     Destroy(passedObject, 1.0f);
     score = score + passedValue;
     scoreText.text = "Score: " + score.ToString();
 }

}

Can someone help me with the power up script. Thank You ^.^v