security.php

<?php

$authenticator = new AuthenticationProviderManager([
    new DaoAuthenticationProvider(
        new InMemoryUserProvider([
            'wouter' => ['password' => 'test', 'roles' => ['ROLE_USER']]
        ]),
        new UserChecker(),
        'cli',
        new EncoderFactory([
            User::class => new PlaintextPasswordEncoder(),
        ])
    )
]);
$tokenStorage = new TokenStorage();

$token = new UsernamePasswordToken(
    $event->getInput()->getArgument('user'),
    $event->getInput()->getOption('pass'),
    'cli'
);

$tokenStorage->setToken($authenticator->authenticate($token));

$accessDecisionManager = new AccessDecisionManager([new RoleVoter()]);

$authorizationChecker = new AuthorizationChecker(
    $tokenStorage,
    $authenticator,
    $accessDecisionManager
);

if (!$this->authorizationChecker->isGranted('ROLE_USER')) {
    throw new AccessDeniedException();
}

// ... show something secret, the user is now logged in