Fourth, Shove is 100% success from an invis enemy - so I use githyanki mage hand which is invis to shove people off. You can also use mage hands between you and enemies with a narrow path so that they have to kill it to get to you.
Mage Hand is a Cantrip that can carry 10 pounds of weight. It's purpose is to push buttons and open doors from a distance or carry small items, not to attack or push anyone. It's D&D description even says
it can't attack. But for Larian, it was an excuse to have even more Shoving in combat. Even though there actually IS a spell called Telekinesis that IS meant to grab and push creatures. And it's 5th level for a good reason, because of the insta-kill potential. But why wait if you can ruin combat with fun insta-kill moves against bosses starting at level 1?