I'm a Bathroom Stalker

Here's the situation: for some reason unknown to myself, or mankind, the teacher in my faculty frequently change the lock on the bathroom. The process should be like this:

1. Make copious copies of new key.
2. Distribute to entire faculty.
3. Replace old lock with new lock.
4. Allow everyone to do their "business" when they please.

Here's how the process goes in our faculty:

1. Replace old lock with new lock.
2. Make a few copies.
3. Allow others to realize they no longer have the correct key.
4. Seek out the select individuals with a correct key.
5. Make a few more copies.
6. Receive another copy of the OLD key.
7. STALK THE BATHROOM FOR SOMEONE WITH A CORRECT KEY SO YOU CAN DO YOUR "BUSINESS".
8. Repeat steps 4 and 5.
9. Pray to sweet, baby Jesus that steps 6 and 7 do not need to be repeated.
10. Receive correct key.
11. Do your "business" whenever you please.

I'm halfway between step 7 and 8. No drinking water at work until step 10 is complete.