When you say pressure do you mean tension?
Apply light tension with tension wrench ( clock-wise ) Pin pick 1,2,3,4,5 searching for pins which feel hard to push this is called ( binded pins)
Then when you feel it feel not springy this is called ( set pin )
Do this a few times til the lock opens and if you feel the plug turn alot this may be cuase it has a security pin ( common security pin Spool )
Push the pin 1,2,3,4,5 til you feel which pin makes the plug go anti-clockwise,This is called negative pin rotation.
When the plug goes back and sets and plug doesnt turn alot like that you have set the false set, Good luck mate
