Step 1: Have an active heist such as the fleca job.
Step 2: Your garage apartment layout when you call your mechanic should be the apartment that you started the active heist in which is on the top and the garage your doing the glitch on the bottom,
Step: 3 Go into the garage that's not connected to the apartment and get inside one of your vehicles.
Step 4: Pull up your phone and hover over the invite to go to your apartment to start the heist.
Step 5: Hold gas and hit X or A and your screen should glitch out and you'll be put in the clouds from a range of 3-4 min.
Step 6: You'll than spawn in front of your garage and wont be able to move.
Step 7: Once you can move request your PV from that garage and drive it in.
Step 8: You'll get stuck on the garage animation just press start and go to creator mode and go into a invite only or public session and when you spawn in your garage all your cars will disappear and you can pull out guns and to get out of your garage just kill yourself and you'll spawn outside and on the radar it will always say that your In your apartment this will also stay from session to session unless you go into story mode or turn off your system
Tip: Make sure your spawn location Is set to your garage that your doing the glitch at such as unit 2 popular street