JWT, composer internal error on Firebase\JWT\JWT

[nitiphone2021]

According to I would like to try to use JWT for my PHP and these are my step

on domain/app/
composer require firebase/php-jwt

so I have 
domain/app/login.php
domain/app/vendor/firebase/...

and on the login.php

        try{
        
        echo "1";
            require_once('vendor/autoload.php');
            
            use firebase\JWT\JWT;
            echo "2";
        } catch (Exception $e) {
            echo 'Caught exception: ',  $e->getMessage(), "\n";
        }

It's not show any thing and error "HTTP ERROR 500"
I think the code is really find the autoload.php but I don't know why it's internet error on line 
use firebase\JWT\JWT;
If I add this command, the PHP will be error 500
 

[requinix]

Have you considered looking for an error message that might explain why you're getting a 500?