OnTriggerEnter not working properly.

Hello. The problem: Whenever I walk into the Trigger and press space, it does what I want. However, if I go back outside the collider, I can still activate it by pressing space. This is not ideal. I want it to only activiate when I am inside the trigger. Thank you.

Script (C#):

 using System.Collections;
 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.SceneManagement;
 
 public class TheFinale : MonoBehaviour {
 
     public string Footsteps;
     public string MouseLook;
     public string PlayerMovement;
     public GameObject MainCamera;
     public GameObject FirstPersonPlayer;
     public Animator thefinale;
     public Animator animat;
     public Animator notasbad;
     public Animator therose;
     public Animator camanim;
     public Animator rainanim;
     public Text textthepromise;
     public Text messenger;
     public RawImage black;
     public AudioSource dirtsteps;
 
     public bool InTrigger;
     Collider Otha;
 
     // Use this for initialization
     void Update()
     {
         if (InTrigger)
         {
             if (Otha.gameObject.name == "Shovel")
             {
                 thefinale.SetBool("ThePromiseIN", true);
 
                 if (Input.GetKeyDown("space"))
                 {
                     (FirstPersonPlayer.GetComponent(Footsteps) as MonoBehaviour).enabled = false;
                     (FirstPersonPlayer.GetComponent(PlayerMovement) as MonoBehaviour).enabled = false;
                     (MainCamera.GetComponent(MouseLook) as MonoBehaviour).enabled = false;
 
                     therose.SetBool("rosepara", true);
                     camanim.SetBool("cameraparaAnim", true);
 
                     StartCoroutine(Final());
                     StartCoroutine(Notasbadco());
                     dirtsteps.Stop();
                 }
             }
         }
     }
 
     private void OnTriggerEnter(Collider other)
     {
         Otha = other;
 
         InTrigger = true;
     }
     private void OnTriggerExit(Collider other)
     {
         InTrigger = false;
     }
 
     IEnumerator Final()
     {
         yield return new WaitForSeconds(5);
         rainanim.SetBool("rainboolOut", true);
         animat.SetBool("BlackFadeParaOUT", true);
         yield return new WaitUntil(() => textthepromise.color.a == 0 && black.color.a == 1);
         yield return new WaitForSeconds(8);
         SceneManager.LoadScene(2);
     }
 
     IEnumerator Notasbadco()
     {
         yield return new WaitUntil(() => black.color.a == 1);
         notasbad.SetBool("notbadparaIN", true);
     }
 }