Assigning one route to multiple user without a package in laravel

I have created four user type admin,vendor,employee,customer. In the user migration file I have the following:

public function up()
{
    Schema::create('users', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('name');
        $table->string('email')->unique();
        $table->char('contact',24)->nullable();
        $table->string('password');
        $table->enum('roles',['admin', 'vendor', 'employee', 'customers']);
        $table->string('image')->nullable();
        $table->timestamps();
    });
}

I have already created middleware for all user type. Admin middleware

public function handle($request, Closure $next)
{
    if ($request->user()->roles == 'admin'){
        return $next($request);
    } else {
        return redirect()->route($request->user()->roles);
    }
}

Customer middleware

public function handle($request, Closure $next)
{
    if ($request->user()->roles == 'customer'){
        return $next($request);
    } else {
        return redirect()->route($request->user()->roles);
    }
}

Vendor middleware

public function handle($request, Closure $next)
{
    if ($request->user()->roles == 'vendor'){
        return $next($request);
    } else {
        return redirect()->route($request->user()->roles);
    }
}

Employee middleware

public function handle($request, Closure $next)
{
    if ($request->user()->roles == 'employee'){
        return $next($request);
    } else {
        return redirect()->route($request->user()->roles);
    }
}

I have included all the middleware in the Kernel.php. Now I want to assign one route to multiple users. For example, Admin and vendor can add, edit, update, delete product while Employee can only edit, s/he can neither add nor delete. I want to sensitive route to admin only.

Answer with explanation will be highly appreciated!