public class IsPlayerNextToDoor : MonoBehaviour
 {
     public Transform door;
     float distance;
     public float maxAllowedDistance = 3f;

     private void Update()
     {
         distance = Vector3.Distance(transform.position, door.position);

         if (distance < maxAllowedDistance)
         {
             isPlayerCloseToDoor = true;
             print("Player is close to door");
         }
         else
         {
             isPlayerCloseToDoor = false;
             print("Player is too far from door");
         }
     }
 }