How to prevent my iPhone photos from being accessed via USB?

I don't want my friend going through my iPhone pictures. I just tried an experiement. I set my phone to "lock immediately" and tried connecting the iphone to my laptop via USB. I could still access my photos even thought my phone was locked! Isn't this a huge security issue? Tried googling to find a solution and didn't find much. The second experiment I tried was sneakily connecting my friend's locked iPhone to my laptop to see if I could access his pictures. Even though his phone was locked, I could NOT access his pictures on my laptop. I'm sure that he actually has pictures on his phone. My friend is very knowledgeable about computers and it's obvious he's encrypting his phone somehow so that his pictures can't be accessed. Can someone explain how I encrypt my phone so that it can't be accessed via USB? (pictures, videos, files, etc.)

Q: How do I prevent my iPhone photos from being accessed via USB?
A: Don't allow anyone else to access your phone.

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