The minimum order amount in the cart

How can I show a notification about the minimum order amount in your plugin?

I am using the code:

// Set this variable to specify a minimum order value
    $minimum = 1000;

    if ( WC()->cart->total < $minimum ) {

        if( is_cart() ) {

            wc_print_notice( 
                sprintf( 'Your current order is %s. Minimum Order Amount - %s.' , 
                    wc_price( WC()->cart->total ), 
                    wc_price( $minimum )
                ), 'error' 
            );

        } else {

            wc_add_notice( 
                sprintf( 'Your current order is %s. Minimum Order Amount - %s.' , 
                    wc_price( WC()->cart->total ), 
                    wc_price( $minimum )
                ), 'error' 
            );
        }
    }

As I understand it, you need to insert it in /public/templates/parts/cart.php. But when I insert all the code, the cart does not work.

How can I use this code in your plugin? Thanks in advance!