How to unlock iPhone without iTunes?

So, people say that it's good to change your passcode every once in a while. I have an iPhone 1st gen. It's not connected to a network. I've just kept it as a backup phone and for games. I changed the passcode a couple months ago and I haven't messed with it since then. I forgot the passcode though! Is there a way for me to unlock it without using iTunes like some people have told me to do? I don't want to have to go through a bunch of stuff to get a "professional" to do it for me. Just trying to see if there's a simple way for me to do it.

1. Put the iPhone inside a drawer.
2. Lock the drawer.
3. Use a key to unlock the drawer.
4. The iPhone is unlocked without iTunes