I was able to jump over the fence in the shed, but am now unable to get out. After server hopping to try and get out, I gave up and logged out to come back another day after server restart. That was 4 days ago and now I have the same issue. It seems that the shed is too close to the fence to allow any access, but the floor on the shed side of the fence is lower than the far side by just enough to prevent getting back over (See screenshot).
Steam ID: http://steamcommunity.com/profiles/76561198048145478/