Help With Automatic Door

So i want to make my door open with the press of a button. Its a normal swinging door. I want to attach a string to it and have a dc motor/winch pull the string to open it. And to close it there will be a spring in the door hinge so the motor will just slowly unwind. Anyone have any tips on what cheap motor i should get. (Preferably under 20$)

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submitted by /u/Hayden591956
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