jwt-auth: JWT Refresh - old token not expiring

Hi, In my laravel 5.3 project, I have written my own middleware to check Authentication and a controller function to get refresh token (when ever we call). But recently I found the old token is not expiring even after the new token is generated. Please see my codes below:

Middleware:

<?php
namespace App\Http\Middleware;

use Closure;
use JWTAuth;
use Tymon\JWTAuth\Exceptions\JWTException;
use Tymon\JWTAuth\Exceptions\TokenExpiredException;

class JWTCustomAuth
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {

    try {

        if (! $user = JWTAuth::parseToken()->authenticate()) {
            return response()->json([
                    'status' => 'FAILURE',
                    'msg'    => 'User not found',
                    'data'   => [],
                ],404);
        }

        } catch (TokenExpiredException $e) {

            return response()->json([
                    'status' => 'FAILURE',
                    'msg'    => 'Token expired',
                    'data'   => [],
                ], $e->getStatusCode());

        } catch (TokenInvalidException $e) {

            return response()->json([
                    'status' => 'FAILURE',
                    'msg'    => 'Token invalid',
                    'data'   => [],
                ], $e->getStatusCode());
 
        } catch (JWTException $e) {

            return response()->json([
                    'status' => 'FAILURE',
                    'msg'    => 'Token absent',
                    'data'   => [],
                ], $e->getStatusCode());

        }

        return $next($request);
    }
}

I have written a function in my controller to manually refresh the token when ever required. Please see the code:

use Tymon\JWTAuth\Exceptions\JWTException;
use Tymon\JWTAuth\Exceptions\TokenExpiredException;

 public function refreshToken()
    {
     
        $token = JWTAuth::getToken();

        if(!$token){
            return response()->json([
                'status' => 'FAILURE',
                'msg'    => 'Token not provided',
                   
            ], 400);

        }

        try{

            $newToken = JWTAuth::refresh($token);

        }
        catch(TokenExpiredException $e){
             return response()->json([
                'status' => 'FAILURE',
                'msg'    => 'Token is expired',
            ], 400);
        }catch(JWTException  $e){
             return response()->json([
                'status' => 'FAILURE',
                'msg'    => 'Token is invalid',
            ], 400);

        }
        return response()->json([
                'status' => 'SUCCESS',
                'msg'    => 'New token created successfully',
                'data'   => [
                    'token' => $newToken,
                ]
                    
            ]);
    }

Everything works fine but the old token still valid even after the new token is generated. I haven’t changed any thing in the JWT/config.php. But I have changed .env file’s CACHE_DRIVER = array for another requirement (Entrust Acl). But I have reverted and checked this. But the problem remains there. Please share your ideas regarding this. Thank you, Harinarayanan T