Wall of Force provides total cover against Wall of Light
The dome created by Wall of Force provides total cover for anything inside the dome from any effect outside it.1 This means that the point of origin for Wall of Light must be outside the dome, as described in the spell targeting rules:
To target something, you must have a clear path to it, so it can't be behind total cover. If you place an area of effect at a point that you can't see and an obstruction, such as a wall, is between you and that point, the point of origin comes into being on the near side of that obstruction.
With the point of origin outside, the spell's area cannot extend through the Wall of Force, as described in the rules for areas of effect:
A spell's effect expands in straight lines from the point of origin. If no unblocked straight line extends from the point of origin to a location within the area of effect, that location isn't included in the spell's area. To block one of these imaginary lines, an obstruction must provide total cover.
This means that if you first trap the target with Wall of Force, you will not be able to hurt them with Wall of Light afterward.
Try casting the spells in the opposite order, using a readied action
However, there is a way to get around this problem: make sure that Wall of Light is cast first, before Wall of Force. The complication is that you don't want the target to be able to move out of the light before you've trapped them with Wall of Force. So, if Lenny is casting Wall of Light and Fran is casting Wall of Force, then the proper setup is:
- On Fran's turn, she casts Wall of Force and readies it to release with a trigger of "immediately after Lenny casts Wall of Light";
- On his turn, Lenny casts Wall of Light on the target;
- Fran's readied action triggers and she uses her reaction to release the Wall of Force, trapping the unfortunate target before they have time to move out of the way.
Alternatively, if Lenny is higher in the initiative order:
- On Lenny's turn, he casts Wall of Light and readies it to release with a trigger of "when Fran gives the signal";
- On Fran's turn, she starts by giving Lenny the signal (verbally, a free action);
- Lenny releases his spell as a reaction;
- Fran continues her turn and casts Wall of Force, trapping the victim.
1 See this answer, which establishes the basis for Wall of Force granting total cover.