While the bonnet is openable, whip out your little digital camera and take a picture of the actual latch that has to be tripped.

File it for future reference so you'll know exactly "where to stick it" the next time you need to resort to screw(driver)ing it.

The latch typically is "greased" pretty liberally, and age and hardening of the old grease is often a contributing factor in such jams. Scraping off any extruded hardened grease, and applying an appropriate fresh and liberal gob - worked into the latch by cycling a few times - should be a regular part of maintenance, every year or so at least. For the bonnet latch a good grade of wheel bearing grease(soda-lithium often preferred) is usually okay and is less likely to age-harden than some chassis greases. You can use almost anything slimy if you adjust the re-lube schedule appropriately.

Door latches often are similar, and may benefit from occasional fresh lube; but designs for them are somewhat more variable. On the doors, you need to be careful about excess that might cause embarassing "spots" on your clothing etc. when you bump up against them. Some shops use a "white grease" on the doors to avoid the stains or make them less apparent, although I've found the same stuff as on the bonnet latch okay if applied a bit more carefully.

John