Camera Lock/freeze on keypress

I’m making a game and I want to add a pause menu, but I need to freeze/lock the camera when I press Escape aka opening the pause menu. I’m using the first person controller from the standard assets asset and using c#

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

public class testCamera : MonoBehaviour   //Camera Script
{
    private testInput _testInputSc; 
    void Start()
    {
        _testInputSc = FindObjectOfType<testInput>();
    }

    void Update()
    {
        Move();
    }

    void Move() //Move function
    {
        if (!_testInputSc._gameIsPaused)
        {
            transform.Translate(new Vector3(1,0,0)); 
        }
       
    }

}

CameraScript

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

public class testInput : MonoBehaviour  //The input script
{
    public bool _gameIsPaused = false;    
    void Update() 
    {
        _gamePause();
    }

    private void _gamePause()
    {
        if (Input.GetKeyDown(KeyCode.Escape))
        {
            _gameIsPaused = true;
        }
        else if (Input.GetKeyDown(KeyCode.Space))
        {
            _gameIsPaused = false;
        }
    }
}

Input script.
You can do it with such a simple method.