One of the fastest crimes to commit in Grand Theft Auto 5 to get some cash is an ATM robbery. This offense allows you to earn from a few tens of dollars up to a hundred. It's not possible to rob an ATM directly like you would a shopkeeper, but there is a simple way to get easy loot by using an ATM.
Steps
Step 1. Find an ATM
They are scattered all over the map. You will usually see them at banks, gas stations, supermarkets, and other shops. For example, look for the Xero Gas Station in Pacific Bluffs, west of Los Santos; at the Little Seoul bank in downtown Los Santos or at the Fleeca Bank in Banham Canyon.
Step 2. Wait for someone to use the ATM
Once you find an ATM, wait for a passer-by to approach and use it. You can proceed on foot or by car; the important thing is not to attack the passerby before he finishes using the ATM, otherwise you will not receive the loot.
Step 3. Follow the passerby
Once he's done using the ATM, he quickly starts chasing him and stays on his trail. Get to a point where there are no more witnesses or at least you don't see cops who might arrest you.
Step 4. Kill the passerby
When you're safe, kill the passer-by who just took the money, using the weapon of your choice. Once your target is eliminated, the money in his possession will fall to the ground. Approach to collect it before it disappears.
Step 5. Leave the area
In a short time, ambulances and police cars will arrive at the crime scene. Get back in the car and quickly move away from the area to avoid getting caught. You can go to the next ATM and repeat the shot.