Online freelancer needs real world part time job (~4h/day)

I decided not to work in an office as a programmer, but now I feel kind of losing my sanity sometimes for lack of human interaction.

Also I find it harder and harder to concentrate.

Can you think of any job I could more or less easily get that is less than 4 hours a day, so I can still do my other work? I have found it hard so far.

I'm based in London, UK, and I speak another European language and I'm a male in my late 20s if that helps.

I know I could do volunteering, but it would be nice to earn a bit of cash too so I can afford my little guilty pleasures which can get expensive in this country, such as, let's see, green peppers for 90c apiece.