class YourClass extends PasswordBroker
{
    public function sendResetLink(array $credentials, Closure $callback = null)
    {
        $user = $this->getUser($credentials);

        if (is_null($user) || $user->active != 1) { //add your condition here
            return PasswordBrokerContract::INVALID_USER;
        }

        $token = $this->tokens->create($user);

        $this->emailResetLink($user, $token, $callback);

        return PasswordBrokerContract::RESET_LINK_SENT;
    }
}