The Idea is simple, download a software that will do the job for you!!
Software name :Auto Keyboard Presser
Step 1 : Assign a key to start recording
Step 2 : start recording using the key you already chose in step 1, and just press E, after that stop recording
Step 3: Make the time between presses 5000 MS
Step 4: Assign a key for playing and go to the game , stand in front of the slot machine and press that key. Leave the game running for at least 1 hour or 2