2D raycast to find and track closest target

Unity Engine
,
1

So I am trying to write an ai behavior for my game where the npc characters will rotate to look at the closest target (a piece of food) to them. I have written code I thought would work, but when applied they just rapidly switch between all targets in the raycast, instead of focusing on the closest one.

    Vector3 GetTargetLocation()
    {
  
      

        RaycastHit2D[] hit = Physics2D.CircleCastAll(transform.position, SenseDepth, Vector2.up, SenseDepth, mask) ;
        for (int i = 0;i < hit.Length; i++)
        {
           
            float currentTarget;
            currentTarget = 10000;

            if (hit[i].distance< currentTarget)
            {
                currentTarget = hit[i].distance;
                senseTarget = true;
                Vector3 target = hit[i].point;
                Debug.DrawLine(transform.position, target);

                return target;
            }
           
          

           
        }

        senseTarget = false;
        return Vector3.zero;
     
    }

This is the code I have to get the targets location to then rotate towards. I might’ve made some obvious mistake, slightly new at this.

2

Not tested:

    Transform GetTarget()
    {
        float closestDistance=100000;
        Transform target=null;
        // OverlapCircleAll ahead of the AI might be better for this:
        RaycastHit2D[] hit = Physics2D.CircleCastAll(transform.position, SenseDepth, Vector2.up, SenseDepth, mask);
        for (int i = 0;i < hit.Length; i++)
        {
            if (hit[i].distance < closestDistance)
            {
                // If you do switch to OverlapCircleAll then you can add a raycast here to make sure the food is actually visible and isn't hidden behind a wall.
                closestDistance = hit[i].distance;
                target=hit[i].transform; // better to return a transform so then your AI can track the target if it's moving. And if the returned transform==null then you know there's no target.
            }
        }
        return target;
    }