What does "break out the layer cake" mean?

In this sentence:

For taxi drivers staring down an even bleaker future of driverless cars at a moment when Washington considers a weekly paycheck bump of $1.50 an occasion to break out the layer cake, it is hard to see where the metaphoric Prozac will come from.

Does "the layer cake” refer to somebody here?


Solution 1:

A layer cake is a fancy cake often eaten at celebrations. So to 'break out the layer cake' is to have a celebration.