Due to the fact that people can easily figure it out, I don't use it as a magical effect as such, however I do use it to get free drinks
I present it as a bar trick, I lay a phone on the table and blow up a balloon saying if you can pick the phone up using just the balloon, and without touching the phone in any way, ill buy you a drink, and if you can't do it and I can, you buy me a drink. They're usually drunk and tend to agree.
After they struggle to do it I say "Ill give you a hint, you actually have to get the phone inside the balloon". At this point they give up and hand you the balloon. I then go ahead and perform Pressure but I do it from the table rather than from the palm of my hand and lift it slightly off the table letting it hang, then I go into the clean up.
This way even if they do figure out the method its still impressive because your not doing it just for the purpose of penetrating the balloon, you done what you said you were going to do (get it off the table without touching it) and if they do really think it went inside then its a bonus.
P.S. Don't try Pressure on a colleagues head at work while your boss isn't around like I did, she just might happen to figure out how to use the security cameras... like mine did.