My little sister eleven, I looked her right in the face
The day that I wrote this song, set her down and pressed play

from Kendrick Lamar – Keisha's Song (Her Pain) Lyrics on Rap Genius

Meaning

Kendrick let his sister hear this song, because he doesn’t want her to end up as a prostitute. Kind of a “scared straight” thing

To be noted: His little sister was 11 when this song was recorded and this is the 11th track.

May also be another connection to Section.80.
The fact that Kendrick has to have his sister listen to this rather explicit (in sexual and violent depiction) song, shows how messed up our society is, that he HAS to let her listen to the song and crush her ideal world to protect her.

In an interview he was asked what was his sisters response he said that she didn’t really understand.

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