Figuring out which function to call for a plugin

[web_master12]

I'm trying to create a plugin where if the final price is 0, instead of showing a price is should say "please call for pricing".

I created a plugin like this,  But I don't see any change.

<?php

namespace <Vendor>\<name>\Plugins;

class Product
{
    public function aftergetCatalogPrice(\Magento\Catalog\Model\Product $product, $finalPrice)
    {
        $price = $product->getData('price');
        if ($price === 0) {
            $finalPrice = "Please call for pricing";
        } else {
            return $finalPrice;
        }
        return $finalPrice;
    }
}

I have a plugin that does call for pricing, but I don't see anything that could be overriding the price.

How can I figure out where the price is being set so I can override it?

Thanks