Small storage rooms free to use

You know the storage rooms on trainstations and some shopping centers, where you drop a coin (10-20 DKK) to store your bag for a period.

I never have coins on me, so I though, why not let me store my stuff for free in exchange for some info...

The process:
1. I put my bag in the storage room
2. Closes the door
3. Locking the door by typing a password of my choise
4. Leaving....

5. Comming back, wanting to get my bag.
6. typing the password
7. If the password is correct, then I'm asked to answer a questionnaire of some kind.
could be:
- Polls about Politics or city plans
- Popular music/art...
- Semi personal: What was your purpose of your visit to this city
- Product related questions

The cost of having the storagerooms are sponsored by the questionnaires.

The questions shouldn't take too long to fill out, and should be anonymous.