AO internal bake all dark

Hi everyone, I do not usually come here very much in the community, because I use very little blender.
Recently, I’ve been working with him a bit, and came across a small obstacle.
I am generating (bake) the AO of the model I created (building), the outside of the model is all ok, but the inside of it is coming out all dark.
I tried to put the lamp (light: point and spot) inside the model to try to generate light in the bake, but I did not succeed.
How do I solve this? How do I make the internal bake do not turn out all dark?