intervention image resizing image by keeping aspectRatio() not resizing image

I'm using intervention\image package for resizing my images. when I resize the image without keeping the aspectRatio() image getting stretched or shrunk. So I used aspectRatio(). now the images are not resizing to the given size.

<?php

namespace App\Http\Traits;

use Intervention\Image\Facades\Image;

/**
 * Trait is used to resize uploaded images to different sizes and 
 * generate webp images of curresponding images.
 */
trait ImagerTrait
{
    public $coverImageSizes = [
        'medium' => [400, 300],
        'small' => [300, 225]
    ];
    public $bannerImageSizes = [
        'medium' => [1200, 600],
        'small' => [998, 500],
        'extra-small' => [768, 450],
        'tiny' => [450, 320]
    ];
    /**
     * Resize the uploading image to different size
     * 
     * @param string $image 
     * @param string $type       type of the image
     * @param string $uploadPath path to image upload folder
     *
     * @return string
     */
    public function resizeImage($image, $type, $uploadPath)
    {
        $imageSizes = '';
        if ($type === 'cover-image') {
            $imageSizes = $this->coverImageSizes;
        } else if ($type === 'banner-image') {
            $imageSizes = $this->bannerImageSizes;
        }
        $name = uniqid();
        $img = Image::make($image);
        $img->backup();

        $img->reset();
        $img->save(public_path($uploadPath . '/' . $name . '.jpg'));
        $img->encode('webp')
            ->save(public_path($uploadPath . '/' . $name . '.webp'), 50);
        $img->reset();
        foreach ($imageSizes as $size => $values) {
            list($width, $height) = $values;
            $img->resize($width, null, function ($constraint) {
                $constraint->aspectRatio();
            });
            $img->save(
                public_path($uploadPath . '/' . $name . '-' . $size . '.jpg')
            );
            $img->encode('webp')
                ->save(
                    public_path($uploadPath . '/' . $name . '-' . $size . '.webp'),
                    50
                );
            $img->reset();
        }

        unlink($image);

        return $name;
    }
}