Aim Lock-On Help

I'm trying to make a script that automatically finds the nearest enemy, then brings the player over to them, grapple hook style. It's sort of like the dash slash in Specter Knight. I've got the code that find the nearest target, but I don't know where to proceed. This is what I have so far.

Transform player;

    Transform target;

    int radius = 10;

    private void Update()

    {

        Collider2D[] targets = Physics2D.OverlapCircleAll(player.position, radius, 8); // find all targets in range



        if (targets != null)

        {

            int index = -1;

            float distance = radius * radius;



            for (int i = 0; i < targets.Length; i++) // test for shortest distance

            {

                float current = (targets[i].transform.position - player.position).sqrMagnitude;



                if (current < distance)

                    index = i;

            }

            if (index != -1)

                // Select target enemy

        }

    }