I dont know about apocrypha, but Enoch and Jasher are directly quoted/cited by biblical figures which gives them validity. It doesn't mean you have to consider them holy scripture; simply works that are referenced by holy scripture. The book of Enoch claims in the first verse that it was written for a 'remote generation' which I believe is now. It was meant to clear up our true history and cosmology, which has been so lied about that people think the Bible is inaccurate.

The testimony of Solomon was probably originally written by him, but I think the surviving versions were transcribed well after Jesus, if I remember right... But it is an account of Solomon identifying, binding, and enslaving demons due to a unique authority God granted him. It was meant to educate people on how demons operate, though these days it is through Jesus and the Holy Spirit that Christians can have power over demons, though we cannot exploit or enslave them like Solomon did. We can only banish them and stop their evil works.