CatalogProductFinalPrice.php

<?php

namespace Marissen\Theme\Service;

use Magento\Catalog\Model\Product;
use Magento\Framework\Pricing\PriceCurrencyInterface;

class CatalogProductFinalPrice
{
    /**
     * @var PriceCurrencyInterface
     */
    private $priceCurrency;

    /**
     * CatalogProductFinalPrice constructor.
     * @param PriceCurrencyInterface $priceCurrency
     */
    public function __construct(PriceCurrencyInterface $priceCurrency)
    {
        $this->priceCurrency = $priceCurrency;
    }

    /**
     * @param Product $product
     * @return float
     */
    public function get(Product $product): float
    {
        return $this->priceCurrency->convert(
            $product->getPriceInfo()->getPrice('final_price')->getAmount()->getValue()
        );
    }
}