Problem with Pause Menu because of WaitForSeconds

I'm making a pause menu for a controller(xbox), also on the keyboard with the use od arrow keys and w,s. The problem is since there is no delay, it automatically goes to the last on possible, since there's 3 options, it only alternates between the first and last, so we are unable to access the second option. I've tried using WaitForSeconds and a delay to get this result but it hasn't worked. Here's my code so far.

 using UnityEngine;

using System.Collections;

public class PauseMenu : MonoBehaviour { private bool paused = false; private delegate void PauseDelegate(); private PauseDelegate currentPauseDelegate; //allows variable to be created through menuFunction

 private float screenHeight;
 private float screenWidth;
 private float buttonHeight;
 private float buttonWidth;

 public GUIStyle font;
 
 private string[] menu = {"Jogar","Opcoes", "Sair",};
 private int selectionIndex = 0;
 private bool clicked = false;
 
 public float keyDelay = 0.25f;
 
 public bool canUse = true;
 
 void Start()
 {
     screenHeight = Screen.height;
     screenWidth = Screen.width;

     buttonHeight = screenHeight * 0.07f;
     buttonWidth = screenWidth * 0.18f;

     this.currentPauseDelegate = pauseMenu;
 }

 void Update()
 {
     Debug.Log("item selecionado"+selectionIndex);
     if (Input.GetButtonDown("Pause"))
         paused = togglePause();
     
     while (true)
     {
         if(Input.GetAxisRaw("Vertical") > 0.5)
         {
             selectionIndex--;
             if(selectionIndex < 0)
             {
                    selectionIndex = 0 ;
             }
         //canUse = false;
         StartCoroutine(InputDelay());
         //yield return new WaitForSeconds(keyDelay);
     }

     if(Input.GetAxisRaw("Vertical") < -0.5)
     {   
         selectionIndex++;   
         if(selectionIndex >= menu.Length) 
         {
                selectionIndex = menu.Length -1;
         }
         //canUse = false;
         StartCoroutine(InputDelay());
         //yield return new WaitForSeconds(keyDelay);
     }
     }
     
     clicked = false;
     if(Input.GetButtonDown("Jump") || Input.GetKeyDown("enter"))
     {
         clicked = true;
     }
 }
 
 IEnumerator InputDelay()
 {
     print("BEFORE");
     yield return new WaitForSeconds(1);
     //yield return new WaitForSeconds(keyDelay);
     print("AFTER");
     canUse = true;
 }
     

 void OnGUI()
 {
     this.currentPauseDelegate();
 }

 void pauseMenu()
 {
     if (paused)
     {
         GUI.Box(new Rect(0, 0, Screen.width, Screen.height), "");

         GUI.FocusControl(menu[selectionIndex]);
         
         GUI.SetNextControlName ("Jogar");
         
         if(GUI.Button(new Rect ((screenWidth - buttonWidth) * 0.1f, screenHeight * 0.3f, buttonWidth, buttonHeight) , new GUIContent("Jogar"), font)  || clicked)
          {
             if(GUI.GetNameOfFocusedControl() == "Jogar")
             {
                     //do something
                 Debug.Log("voce ativou o botao jogar");
                 paused = togglePause();
             }
         }


          GUI.SetNextControlName ("Opcoes");

         if(GUI.Button(new Rect ((screenWidth - buttonWidth) * 0.1f, screenHeight * 0.4f, buttonWidth, buttonHeight), new GUIContent("Opcoes"), font)  || clicked)
          {
             if(GUI.GetNameOfFocusedControl() == "Opcoes")
             {
                     //do something
                 //this.currentPauseDelegate = OptionsMenu;
                 Debug.Log("voce ativou o botao opcoes");
             }
          }
         
         GUI.SetNextControlName ("Sair");

         if(GUI.Button(new Rect ((screenWidth - buttonWidth) * 0.1f, screenHeight * 0.5f, buttonWidth, buttonHeight), new GUIContent("Sair"), font)  || clicked)
          {
             if(GUI.GetNameOfFocusedControl() == "Sair")
             {
                 Debug.Log("voce ativou o botao sair");
                     //do something
             }
          }
     }
 }

 bool togglePause()
 {
     //nome do script da camera
     WowCamera2 xDeg = Camera.main.GetComponent<WowCamera2>();
     WowCamera2 yDeg = Camera.main.GetComponent<WowCamera2>();
     
     if (Time.timeScale == 0f)
     {
         xDeg.enabled = true;
         yDeg.enabled = true;
         Time.timeScale = 1f;
         return (false);
     }
     else
     {
         xDeg.enabled = false;
         yDeg.enabled = false;
         Time.timeScale = 0f;
         return (true);
     }
 }

 private void OptionsMenu()
 {
     if (paused)
     {
         GUI.Box(new Rect(0, 0, Screen.width, Screen.height), "");
         VolumeControl();
         
         if (GUI.Button(new Rect((screenWidth - buttonWidth) * 0.5f, screenHeight * 0.85f, buttonWidth, buttonHeight), "Voltar", font))
         {
         // go back to the main menu
             //this.currentPauseDelegate = pauseMenu;
         }
         
         if (Input.GetButtonDown("Pause"))
         {
             this.currentPauseDelegate = pauseMenu;
         }
     }
 }

 private void VolumeControl()
 {
     GUI.Box(new Rect(0, 0, Screen.width, Screen.height), "");
     GUI.Label(new Rect((screenWidth - buttonWidth) * 0.5f, screenHeight * 0.15f, buttonWidth, buttonHeight), "Volume", font);
     AudioListener.volume = GUI.HorizontalSlider(new Rect((screenWidth - buttonWidth) * 0.5f, screenHeight * 0.22f, buttonWidth, buttonHeight), AudioListener.volume, 0, 1);
 }

}