This is done by going into a shop that has a safe and aiming any gun (except the rocket launcher) at the clerk's head. The clerk will raise their hands and say 'Don't kill me'. Keep aiming the gun at the clerk and they will start to move toward the safe. Follow the clerk making sure you don't take your aim away from their head otherwise they will lower their hands and sound the alarm. If you keep your gun aimed at them until the clerk gets to the safe they will open it for you allowing you to take whatever is inside. Note: this will raise your felony, but will not sound the alarm.