Go into a shop that has a safe, then aim any gun except the rocket launcher at the clerk. You will have started a hold up and the clerk will put their hands up and say "Don't kill me". Keep aiming the gun at the clerk and they will start to move toward the safe. Follow them while still aiming your gun at them, or they she will put their hands down and sound the alarm. If you keep your gun aimed at them until they get to the safe, they will open it for you. You can now get what is in the safe. Note: This will raise your felony, but will not sound the alarm.