Whether you're using a
British spudger or a pry tool, opening enclosures is black art. Even using every plastic or stainless pry tool available, some shut lines will stay shut.
The guys over at
https://www.ifixit.com have a few features on
tricky enclosures, such as how not to break an iPhone or an iMac screen when ripping off the screen - which is so thoughlessly glued on by Apple's genius design engineers. Ifixit will even sell you the toolsets required.
As for snap together cases, they always snap their clasps when pulled apart. Some enclosures were never meant to be opened for safety; such as power bricks that are sonic or accetone welded. For pry tool read Dremel/file/saw/hammer/house brick.
Of late, this has been my GOTO pry tool. It's sharp on the edges, but not to hard to dint the plastic and, offers good leverage.
https://www.ebay.co.uk/itm/283989799200