Get the lowest value from a Gameobject List

How can i obtain a gameobject from the list based on how far is the agent from the list ?

In here every ai agent has an AISight component that contain a distance float value to calculate between itself and the current target , Based on that what would be the best approach in order to assign the closest ai agent to a target as a currentLeader

  public class AiGroupManager : MonoBehaviour
                 {
                     public List<GameObject> aiGroup;
                     public List<GameObject> aiWithTarget; 
                     
                     public GameObject currentLeader;
         
                     void GetLeader()
                     {
                         
                         if (currentLeader == null)
                         {
                             for (int i = 0; i < aiGroup.Count; ++i)
                             {
                                 
                                 //
                                 if (aiGroup[i].GetComponent<AISight>().ClosestTarget != null)
                                 {
                                     if (!aiWithTarget.Contains(aiGroup[i].gameObject))
                                     {
                                         var ss = aiGroup[i].gameObject;
                                         aiWithTarget.Add(ss);
         
         
                                     }
                             }