Hello and welcome to our web page here my name is Enes I'm a Certified Volvo Car Expert Mechanic.I'm going to try today to answer your question.
most problem if it fails to lock is bad lock it slef they go bad a lot
so i would not try to close if you close the boot it can close and you cant open
i would replace as soon as posible the boot lock and you can replace it your self
[IMAGE][SRC][/SRC][ALT][/ALT][WIDTH]100[/WIDTH][HEIGHT]100[/HEIGHT][STYLE]margin-top: 0px; width: 304px; height: 166px; margin-left: 0px; margin-right: 0px;[/STYLE][/IMAGE]
remove the clips and fold cover down
than you have access to lock
after you remove cover lock is easy to see and bolts are easy to access
other problem is wire harness in trunk goes bad but that is more problem you can close trunk and it will latch but you cant open it .
but you say you cant latch using screwdriver than is bad lock it self
you need more help
i see you rated me bad im here to help if you need more help
are you still online do you have more questions for me reply here