Not to start it. For that you just need a lever. Handle of a fork or spoon works. Once it's punctured you can use your finger, carefully and slowly. Some people aren't good at that though, so use your best judgement. You can always use the same level to continue pushing it inwards.

So much better than the old pull tabs. They could be dangerous when they did work, they were a safety hazard if not disposed of, and a tab on those that came out? Now you have a problem, that was not an easy fix.