Q: can you reset security questions if you walk into an apple shop

Reset your security questions

1. Go to My Apple ID (appleid.apple.com).
2. Select “Manage your Apple ID” and sign in.
3. Select “Password and Security” on the left side of the page.
4. If you have only one security question, you can change the question and answer now.
5. If you have more than one security question:
   • Select “Send reset security info email to [your rescue email address].” If you don't see this link or don't have access to your rescue address, contact Apple Support as described in the next section.
   • Your rescue address will receive a reset email from Apple. Follow its instructions to reset your security questions and set up new questions and answers. Didn't receive the email?

After resetting your security questions, consider turning on two-step verification. With two-step verification, you don't need security questions to secure your account or verify your identity.

The Apple store staff will not change your questions/answers...doing so would not be secure.  They may let you use one of their computers to go to http://support.apple.com/kb/HT5699 and then contact the appropriate Apple ID Security site on-line to change the questions/answers.