I think I may have left the narc safe unlocked

Just finished a shift, I work at costco, and its been a couple of months of me working here as a new grad, and Im not 100% sure but I believe its possible I may have left the narc safe unlocked today before leaving. The reason Is because we had a ton of people filling prescriptions last minute at the store, not using this as an excuse, but me being preoccupied with multiple issues at once during closing may have led me to forget to lock the narc safe before locking up the pharmacy. Im just really worried about what might happen next as this has never happened before. What should I do at this point, I have no way to get back into the pharmacy considering its within a costco :(