The situation in North Korea is actually slightly worse than indentured servitude. The slave owner historically promises, in effect, at least to keep his slaves fed. In North Korea, this compact has been broken. It is a famine state as well as a slave state.
Partly because of the end of favorable trade relations with, and subsidies from, the former USSR, but mainly because of the lunacy of its command economy, North Korea broke down in the 1990s and lost an unguessable number of people to sheer starvation. The survivors, especially the children, have been stunted and malformed. Even on a tightly controlled tour of the place, my robotic guides couldn't prevent me from seeing people drinking from sewers and picking up individual grains of food from barren fields.
In consequence of this, and for the first time since the founding of Kim Il Sung's state, large numbers of people have begun to take the appalling risk of running away. If they make it, they make it across the river into China, where there is a Korean-speaking area in the remote adjoining province. There they live under the constant threat of being forcibly repatriated.
The fate of the fugitive slave is not pretty: North Korea does indeed operate a system of camps, most memorably described in a book—The Aquariums of Pyongyang, by Kang Chol-Hwan—that ought to be much more famous than it is. Given what everyday life in North Korea is like, I don't have sufficient imagination to guess what life in its prison system must be, but this book gives one a hint.
[From an article by Christopher Hitchens, Slate]