Pre-Setting the locks

I've heard from people that they preset their locks, either they preset the first number or the furst two numbers. I think the most risky and efficient way is to preset everything. Just pull and it's open. There will be a very small chance that it is going to be opened by some other guy, because who will go around school and pull on people's locks?! If you want to be more safe, the preset the first two numbers. Just turn to the third number and it's opened. It's pointless to just preset one, so either two or three. It's a good way to do this between classes or right after lunch. (DISCLAIMER!!!I hold no responsibility for anybody that gets detention, sent to office, suspended, expelled, beaten up, executed, or any way he or she is being assaulted both physically and emotionally.)