How to create JWT token in Symfony5?

I'm trying to create REST API with JWT authentification in Symfony5. At first I've tried to do as written here https://h-benkachoud.medium.com/symfony-rest-api-without-fosrestbundle-using-jwt-authentication-part-2-be394d0924dd . Difficulties appeared when I've tried to make method getTokenUser:

    /**     * @param JWTTokenManagerInterface $JWTManager     * @return JsonResponse     * @Route("/api/login_check", name="api_login_check", methods={"POST"})     */    public function getTokenUser(UserInterface $user,JWTTokenManagerInterface $JWTManager)    {        return new JsonResponse(['token' => $JWTManager->create($user)]);    }

Symfony says that UserInterface is not service so it can't Autowire it.Ok, then I've tried to find another articles about this problem. But surprisingly they just doesn't say how to write this method. For example, here https://digitalfortress.tech/php/jwt-authentication-with-symfony/ appears like route /api/login_check must work authomatically if it configured in security.yaml and in routes.yaml. But no, it doesn't work.

So how must I write controller?

My security.yaml is:

security:    encoders:        App\Entity\User:            algorithm: bcrypt    # https://symfony.com/doc/current/security.html#where-do-users-come-from-user-providers    providers:        app_user_provider:            entity:                class: App\Entity\User                property: email    firewalls:        login:            pattern:  ^/api/login            stateless: true            anonymous: true            json_login:                check_path:               /api/login_check                success_handler:          lexik_jwt_authentication.handler.authentication_success                failure_handler:          lexik_jwt_authentication.handler.authentication_failure        api:            pattern:   ^/api            stateless: true            provider: app_user_provider            guard:                authenticators:                    - lexik_jwt_authentication.jwt_token_authenticator        dev:            pattern: ^/(_(profiler|wdt)|css|images|js)/            security: false        main:            anonymous: true            # activate different ways to authenticate            # https://symfony.com/doc/current/security.html#firewalls-authentication            # https://symfony.com/doc/current/security/impersonating_user.html            # switch_user: true    # Easy way to control access for large sections of your site    # Note: Only the *first* access control that matches will be used    access_control:        - { path: ^/register, roles: IS_AUTHENTICATED_ANONYMOUSLY }        - { path: ^/api/login, roles: IS_AUTHENTICATED_ANONYMOUSLY }        - { path: ^/api,       roles: IS_AUTHENTICATED_FULLY }