Clumsy act in office

Last thursday, i was so sad and clumsy...hump...during lunch hours, i was about to leave my office room (our own account dept room). Then one of the audit manager came in our room wanting to know some information so i helping him. Then we left the room, withut knowing it, i accidentally locked the door. Oh gosh, after i came back fromt he bank, i saw my manager in the pantry so i asked her "oh you having lunch in the pantry" then she replied me cos i locked the office door. I got a shock, i didnt bring the key along lo...really very clumsy rite. Then i have no choice got to call a locksmith to help us unlock the door. So the locksmith came and within 5 mins, the doors was unlocked. Although the manager said use the petty cash to pay the locksmith but i decided to paid it cos it my fault by accidentally lockin up the door. What a bad day lo and have to pay this unnecessary expenses.