you are under the impression that it pops when you hit the lock. most alarms won't do this. unlock the car and then push the lever under the handle to the left. this will open the hatch

you must then allow the handle to snap back to the right, otherwise the whole system gets messed up and your hatch won't shut.

if this does happen you must lock your car, unlock it, push the handle to the left (while the hatch is open) and then let it snap back to the right before attempting to close it.

it's tricky but it will come with experience.