how do i check if a gameobject is not active?

How do i check if the lantern is not active? i think my code is good, but i supouse i'm not taking into acount something :v

using System.Collections; using System.Collections.Generic; using UnityEngine;

 public class Linterna : MonoBehaviour {
 
     public GameObject lantern;
 
     // Use this for initialization
     void Start () {
         
     }
     
     // Update is called once per frame
     void Update () {
 
         if (Input.GetKey(KeyCode.L) && lantern.activeSelf)
         {
             lantern.SetActive(false);
         }
         else if (Input.GetKey(KeyCode.L) && !lantern.activeSelf)
         {
             lantern.SetActive(true);
         }
 
     }
 }