I believe you have to pay every time you open that locker. We hid our car key, and used an ice chest and filled it with drinks and snacks and left it in our car, you can take your own water bottles inside park, no one messed with our bags or towels that we left on grass area and picnic tables.
The locker I got was $13 & it was keyless. You chose a pin to open the door. Different sized lockers cost different prices.
Thanks! Your answer is awaiting moderation.