We don’t see the Vice President wearing chunky heels that often; the Alba Suede Block-Heel Pump ($675, out of stock) is an exception. Below you see the shoe in black suede; the Vice President has worn the black leather style.
The point-toe style has a low-cut vamp and a 4.3″ heel; it was offered in multiple colors and fabrics. It looks like then-Senator Harris wore the pumps at an August 2017 event in Oakland.
You can also see a photo of the Senator at that event by visiting Flickr.