MinimalTierPriceCalculator.php

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<?php
namespace Magento\Catalog\Pricing\Price;

use Magento\Framework\Pricing\SaleableInterface;
use Magento\Framework\Pricing\Adjustment\CalculatorInterface;
use Magento\Framework\Pricing\Amount\AmountInterface;

class MinimalTierPriceCalculator implements MinimalPriceCalculatorInterface
{
    private $calculator;

    public function __construct(CalculatorInterface $calculator)
    {
        $this->calculator = $calculator;
    }

    public function getValue(SaleableInterface $saleableItem)
    {
        $price = $saleableItem->getPriceInfo()->getPrice(TierPrice::PRICE_CODE);
        $tierPriceList = $price->getTierPriceList();

        $tierPrices = [];
        foreach ($tierPriceList as $tierPrice) {
            $price = $tierPrice['price'];
            $tierPrices[] = $price->getValue();
        }

        return $tierPrices ? min($tierPrices) : null;
    }

    public function getAmount(SaleableInterface $saleableItem)
    {
        $value = $this->getValue($saleableItem);

        return $value === null
            ? null
            : $this->calculator->getAmount($value, $saleableItem);
    }
}