pull out your phone select quick job then hold every button, leave job, you should spawn in glitched out kitchen with oven set to 350 degrees, awaiting grenade.
http://www.se7ensins.com/forums/forums/grand-theft-auto-v-support.429/
try the support section, despite the uh, apparent misleading name.... people actually get support here.
i don't understand why people think since there is a new method to store vehicles, it's just going to automatically bypass the fact that some vehicles are banned from being stored.
not sure what misled you to this section, but here's some help. (modding, for a giveaway? LOL!)
http://www.se7ensins.com/forums/forums/grand-theft-auto-v-matches.434/