It works to an extent that you can do it and likely can reduce the house edge a tiny bit. However, you will not be able to gain an advantage over the house. This is due to the deck penetration, which does not reach the depth needed.
For you to successfully take advantage of counting cards, this should be around 70% - all live blackjack providers seem to limit it at 50% (to our knowledge at least). Some people claim this is still beatable as long as you can have a large spread for bet-sizing, but we would not consider ourselves qualified enough at this particular skill to make such a statement.
Having that said, counting cards at live blackjack can still be a lot of fun and adds an extra dimension to play. If you are one of those players that like the mathematics side of gambling and don’t play to make a living, counting can still be a decent approach to take.