From this distance my guess is pittosporum. But you need close ups and pictures of flowers or any unique features ... whatever the plant has in order to ID.

The entrance looks like for only skinny people who are willing to step sideways to get through the tight spots.

Yardvaark is right. It's impossible to id the hedge from the picture. But depending on where you live there are lots of evergreens which would give you the same effect. Judging by the bicycle the entrance is wider than it looks - at least four feet. If a person needs to step sideways it's not the gateway which needs altering....

I think those are called "pain in the butt to maintain" lol

If you can get a close up of the leaf shape we can definitely help. From this distance it could be many different types of evergreen shrub.

It looks similar to a type of cherry hedge, but definitely need a closer look. Cherry hedges are common in Florida.