This trophy is cutscene-related, so if you skip through them, you can miss getting this. You have been warned.
After having your gang taken from you, talk to the bartender to get the keys back to your bike. A little negotiating will be required, such as using the HAND icon and grabbing his nose ring. Ben will drag the bartender down to his level, but at least you'll get a bit more information as well as your keys.