Can't make time go down after picking up a coin,

So what i have is a "coin" which is just a game object to act as a trigger with a script attached to it that does 3 things: play a sound, call a function from my timer script, and then destroy the coin. The audio is played, the coin disappears, but my timer just keeps going with the same time. I think its worth noting that I'm almost brand new to Unity and coding in general, so I still don't understand a large chunk of c#.

Here is my timer

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class Timer : MonoBehaviour {
 
     public Text counterText;
     public float seconds, minutes;
     bool keepTiming;
     private float _time = 0.0f;
 
     // Use this for initialization
     void Start ()
     {
         counterText = GetComponent<Text>() as Text;
         StartTimer();
     }
 
 
     void StartTimer()
     {
         keepTiming = true;
     }
    
     private void Update()
     {
         if (keepTiming)
         {
             UpdateTime();
         }
     }
 
     // Update is called once per frame
     void UpdateTime()
     {
         _time += Time.deltaTime;
         minutes = (int)(Time.time / 60f);
         seconds = (int)(Time.time % 60f);
         counterText.text = minutes.ToString("00") + ":" + seconds.ToString("00");
     }
 
     public void SubtractTime()
     {     
        _time -= 5.0f;
     }
 
     public void StopTimer()
     {
         keepTiming = false;
     }
 }

And here's the script i placed on my coin

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class CoinCollect : MonoBehaviour {
 
     public Timer script;
     public GameObject trigger;
     public AudioSource audioClip;
 
     private void OnTriggerEnter(Collider collider)
     {
         if (collider.tag == "Player")
         {
             trigger.SetActive(true);
             audioClip.Play();
             script.SubtractTime();
             Destroy(gameObject);
         }
     }
 
     private void OnTriggerExit(Collider collider)
     {
         if (collider.tag == "Player")
         {
             trigger.SetActive(false);
         }
     }
 }

I'm just really lost on how to fix this, so any advice is greatly appreciated.

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