How do I make a hl2 sp map return to the title screen at the end?

Been trying to figure this out and internet searches have not been helpful, if anyone can explain to me how its done I will be thankful as this has been driving me insane.

Found the solution after decompiling the game's end credits. Did not expect it to be done by directly entering a command into the console via a entity.

EDIT

I will add the solution for people who may come across this for a solution at some point

You need a point_clientcommand entity

Now you need a trigger with this output

OnTrigger > [Name of point_clientcommand entity] > Command > startupmenu force