The miniature sun hack requires ignoring D&D 5E designer Jeremy Crawford confirming that wall of force provides total cover: https://twitter.com/jeremyecrawford/status/67755666233340313...

Question:

> could a wizard make a sphere around a creature using wall of force and then chill touch to damage them through the wall?

Answer:

> Unless a spell says otherwise, you can't target someone behind total cover (PH, 204). [Amending another tweet] #DnD

You wouldn't be able to enlarge an object behind a wall of force.

That one also requires a very narrow reading of enlarge that an enlarged object in a small space continues increasing in mass once it stops increasing in size.