There might be an iFixit guide on how to disassemble an A02s. It's not a 'sealed' phone aka waterproof. The A02s has zero IP rating. Considering the knockoffs that Smoorez on YouTube has taken apart and put back together in working order are built much, much worse, I don't think it's that hard so long as you don't break the LCD or the ribbon cables connecting it to the board.
If just saving the card is your only goal, then having the phone work afterward isn't that big of a deal (it's a $49 smartphone after all).
I am thankful I don't have to live with a modern phone anymore. I successfully got Verizon to cooperate with me and get my Galaxy S4 Mini going again, which has not only a removable battery, but a headphone jack, screen size small enough to fit in one hand, and even an IR blaster, not to mention a skeuomorphic UI. The issue that killed my Thunderbolt was actually a SIM provisioning issue (putting the SIM into an A13 5G to test it out caused it to provison CDMA-less and broke compatibility). I could use my Thunderbolt if I wanted to, but the S4 mini has better features and app compatibilty.
Heck, I just spent a lot of time and some $$ to get my home's tech back into the year 2010, finally finishing it up with a 2010 LinkSys Wireless N router. Nothing in the home now goes past the years 2009-2014, the peak era of tech.