Re: You don't need magic encryption, OR a drill
No worries, simply pick the lock. I've done that at my office many times. Key lost, key broken, key locked in the cabinet (yes...). My best time to open a standard filing cabinet using a bent nail and paperclip is ten seconds. When I bought myself a pick set, that dropped to five seconds. Some are more difficult than others, such as the fire cabinets here with anti-picking features. Those take much longer, but I get 'em. Recently I had to pick the security lock on the electrical room (generator failed during power outage) because a manager had misplaced the key. Fifteen minutes to noodle that one, and avoided calling out a locksmith at 3:30 AM.
It's one of the best skills you can learn, and kinda fun as well.