How to make add to cart button disabled when the amount is less then minimum and enable it when amount is minimum and more?

Question

The minimum order amount has to be 1500. I try to make add to cart button disabled when the amount is less then needed, and to enable it back when it's 1500 or more. I use this code

add_action( 'woocommerce_single_product_summary', 'woocommerce_total_product_price', 31 );
function woocommerce_total_product_price() {
    global $woocommerce, $product;
    // let's setup our divs
    echo sprintf('<div id="product_total_price" style="margin-bottom:20px;">%s %s</div>',__('Your order amount:','woocommerce'),'<span class="price">'.$product->get_price().'</span><p style="font-weight: bold;">The minimum order amount is<span style="color:red;">1500 ₽</span></p>');
    ?>
        <script>
            jQuery(function($){
                var price = <?php echo $product->get_price(); ?>,
                    currency = '<?php echo get_woocommerce_currency_symbol(); ?>';

                $('[name=quantity]').change(function(){
                        if ((this.value < 1500)) {
                        var product_total = parseFloat(price * this.value);                        
                         $('.button.single_add_to_cart_button.button.alt.fa-cart').addClass('minimum-disabled');
                        $('#product_total_price').html('Your order amount: '+  product_total.toFixed(2) + ' ' + currency + '<p style="font-weight: bold;">The minimum order amount is <span style="color:red;">1500 ₽</span></p>');                      
                    }
                    else{
                        var product_total = parseFloat(price * this.value);
                        $('.button.single_add_to_cart_button.button.alt.fa-cart').removeClass('minimum-disabled');
                        $('#product_total_price .price').html( product_total.toFixed(2) + ' ' + currency);
                        
                    }
                });
            });
        </script>
    <?php
}

But when the amount is became 1500+, the class 'minimum-disabled' doesn't remove. The button still has it. What can be wrong and how to fix it? CSS of this class

.minimum-disabled{
    pointer-events: none!important;
    background: #dfe1f0!important;
    border-color: #dfe1f0!important; 
    color: rgba(51,51,51,.5); 
    cursor: no-drop!important;
}

The website is here, you can see it.

There's the needed quantity is 53. You can enter 52 and 53 to see the difference.

Answer 1

I figured out. I was wrong in if ((this.value < 1500)) It's product quantity, not a price. More actual version is below(I haven't translated strings, but the text is in the question, if it will be needed for someone). I was wrong, but maybe someone will need my idea - to disable this button.

add_action( 'woocommerce_single_product_summary', 'woocommerce_total_product_price', 31 );
function woocommerce_total_product_price() {
    global $woocommerce, $product;
    // let's setup our divs
    echo sprintf('<div id="product_total_price" style="margin-bottom:20px;">%s %s</div>',__('????? ??????:','woocommerce'),'<span class="price">'.$product->get_price().'</span><p style="font-weight: bold;">??????????? ????? ?????? <span style="color:red;">1500 ?</span></p>');
    ?>
        <script>
            jQuery(function($){
                var price = <?php echo $product->get_price(); ?>,
                    currency = '<?php echo get_woocommerce_currency_symbol(); ?>';

                $('[name=quantity]').change(function(){
                     var product_total = parseFloat(price * this.value);

                        if (( product_total < 1500) ) {
                          $('#product_total_price p').removeClass('d-none');                        
                          $('.summary .button.single_add_to_cart_button.button.alt.fa-cart').addClass('minimum-disabled');
                          $('#product_total_price ').html('C???? ??????: '+  product_total.toFixed(2) + ' ' + currency + '<p style="font-weight: bold;">??????????? ????? ?????? <span style="color:red;">1500 ?</span></p>');                      
                    }
                    else{                       
                        $('.summary .button.single_add_to_cart_button.button.alt.fa-cart').removeClass('minimum-disabled');
                         $('#product_total_price ').html('C???? ??????: '+  product_total.toFixed(2) + ' ' + currency); 
                        $('#product_total_price p').addClass('d-none');                        
                        }
                      }); 
                    });
               
        </script>
    <?php
}