No idea where you've got the figure from to 'vaporize' a human being, but 3 GJ isn't all that much energy. The Grand Coulee dam could generate that in a little under two and half seconds, for example.
ERBs are pretty much non-traversable. Have a read of
this paper for examples of traversable (particles and at the end of the paper, humans) wormholes. Note the figures for the minimum size of the wormhole's diameter and length of it to be passable by humans: 15,000 km and 3000 light years respectively. In other words, bigger than the Earth and no journey shorter than 3 kly either. Oh and the energy requirements for generating the two wormholes in the first place...