Need help with writing a bool to call a function

At the moment I'm currently trying to have the player collide a trigger, if the player triggers it call a the AttackPlayer function. Also I have a bool to set if true, then call that function. However I haven't coded for awhile and still somewhat new to c# so if I could get some urgent help, it would be greatly appreciated.

using UnityEngine; using System.Collections;

public class Enemy : MonoBehaviour {

 public Transform target; 

 public float speed = 2f; 
 private float minDistance = 5f;
 private float range; 

 private bool chase = false;

 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void AttackPlayer () { 

     range = Vector2.Distance (transform.position, target.position); 

     if (range > minDistance) { 
         transform.position = Vector2.MoveTowards (transform.position, target.position, speed * Time.deltaTime);

     } 

 } 

 void OnTriggerEnter2D (Collider2D target) { 
         
     if (target.tag == "Player") { 
         chase = true; 
     } 

     if (chase == true) { 

     }

 }

}