They're designed to cause regime change, or at least diplomatic changes. That has failed in Venezuela's case (and Cuba's, and North Korea's, and Iran's, and so on).
What's funny (actually, it's very sad) is that any sanctions strong enough to truly harm Russia would destroy the stability of the world's financial system by triggering a global liquidity crisis; we would see a repeat of 2008 (likely worse due to some factors having changed since then). Be careful what you wish for, as those who virtue signal naively today, thinking it'll only affect citizens in faraway lands, may themselves face frozen ATMs, credit cards, and bank transfers in a few months, if the worst-case (i.e. their dream scenario) occurs.