Add product to cart in Magento 2

BlockClass.php

    public function __construct( 
      \<Vendor>\<ModuleName>\Helper\HelperName $helperName,
      array $data = []
    ) {
        $this->_helperName = $helperName;
    }

HelperName.php

namespace <Vendor>\<ModuleName>\Helper;

class HelperName extends \Magento\Framework\App\Helper\AbstractHelper

    public function __construct( 
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\Data\Form\FormKey $formKey,
        array $data = []
    ) {
        $this->_storeManager = $storeManager;
        $this->_formKey      = $formKey;
        parent::__construct( $context, $data );
    }

	public function getAddToCartUrl( $productId ){

        $resultPage = $this->_resultPageFactory->create();
        $params = array(
            'form_key'  => $this->_formKey->getFormKey(),
            'product'   => $productId,  // Product Id
            'qty'       => 1            // Quantity of product
        );

        $addToCartUrl = $this->getCurrentStore()->getBaseUrl() . 'checkout/cart/add/?' . http_build_query( $params );
        return $addToCartUrl;
    }
    
    public function getCurrentStore(){
        return $this->_storeManager->getStore();
    }

}

Your.phtml

$addToCartUrl = $this->_helperName->getAddToCartUrl( $product->getId() );