Using entitymanager while authenticating

   Hello,
in my LoginManager I'm tring to verify if the user passoword has expired

I do so

  protected override bool ValidateUserCore(ILoginCredential credential)
        {
            bool res = base.ValidateUserCore(credential);

            //if (res)
            //{
            //    //Verifico che non sia scaduta la password

            //    EntityManager.ExecuteQuery();

            //    myModelContainer container = new myModelContainer(new EntityManagerContext(true));

            //    var user = container.aspnet_Users.FirstOrDefault(o1 => o1.UserName == credential.UserName);

            //    if (user != null)
            //    {
            //        DateTime expiryDate = DateTime.Now;
            //        if (user.USER_ACCOUNT_EXPIRY != null)
            //        {
            //            expiryDate = user.USER_ACCOUNT_EXPIRY.DATA_SCADENZA.Value;
            //        }

            //        if (expiryDate < DateTime.Now)
            //        {
            //            throw new ExpiredLoginException(expiryDate);
            //        }
            //    }

            //}

            return res;
        }

But I got an exception since the EntityManager is not authenticated, since I need to have the guest account disabled and I'm on the server during the login phase, what can I do to have access to my table?
Thanks