when you rent the large lockers in the front, you can open them all day long.
what you paid for the locker is good until you leave the park that evening.
you pay a one time fee for them.
the other lockers in the park near the rides, you pay each time you open/close them.
they are basically a one time only use.
many take lunches, change of clothing, beverages, food, etc that will be used throughout the day so you don't have to lug them with you all day.
it's a good thing the studios has these family lockers.
i've been with peeps that have used them and it hasn't been an issue to return to them for something they stored in there.
now if you only have to use a locker for a bag you can't take on a ride, of course use the free lockers by the ride.
if you are staying from opening until closing and plan to bring your own food, beverages, clothing change, etc, the family paid lockers are a good deal.
there are guests that stay off site and only come for one day.
the locker set up is convenient for them to use for that day.