middleware options?

Question

Laravel

Good night, I don’t understand why what is written on the documentation site does not work for me ... I
use standard Laravel authentication, but in addition to everything, there are routes that should be available only to users with specific roles. Based on the documentation, I wrote the following
created the hasRole method in the User model

public function hasRole()
    {
      return $this->role;
    }

Created a mediator and gave it a name in Karnel.php
mediator

public function handle($request, Closure $next, $role)
    {
        if (!Auth::user()->hasRole($role)) 
        {
            return redirect(abort(403));
        }
        return $next($request);
    }

Karnel.php

protected $routeMiddleware = [
        'auth' => \Illuminate\Auth\Middleware\Authenticate::class,
        'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
        'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
        'can' => \Illuminate\Auth\Middleware\Authorize::class,
        'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
        'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,

        'role' => \App\Http\Middleware\role::class,
    ];

and the actual file and routes

$router->group(['prefix'=>'/dashboard', 'middleware'=>'auth'], function($router)
{
    $router->group(['middleware'=>"role:administrator"], function(){
        Route::get('/admin', function(){
            print "Administrators part here";
        });
        //some admin routes

    });

    $router->group(['middleware'=>"role:client"], function(){
        Route::get('/client', function(){
            print "Client part here";
        });
        //some client routes
    });
});

And in this form, it lets me into any of the routes, regardless of the role, what to do and where to look? Thank you!