Change float value with Button Onclick

I have this timer script to let an object disappear. By giving sec a value I can adjust the time. But now I want to access and change this value from Button > OnClick so I started function SecVideo. How do I let this function make adjusting the float sec possible with a button click event?

 using UnityEngine;
 using System.Collections;
 
 public class timer : MonoBehaviour {
 
     public float sec;
     public void SecVideo(float sec) 
     {}
         
     void Start()
     {    StartCoroutine(LateCall());
     }
     
     
     IEnumerator LateCall()
     {
         yield return new WaitForSeconds(sec);
         
         gameObject.SetActive(false);
         //Do Function here...
     }
     
     // Update is called once per frame
     void Update () {
     }
 }