Fuses work or they don't, continuity or not. If it's bad, it is burnt out and not giving voltage, it doesn't work.
When you press the button to open the trunk, a solenoid pulls the catch, and the trunk opens and the catch remains open.
When you press down on the truck lid, the catch base is pressed mechanically and it locks shut.
Your issue is almost certainly 'Adjustment', the catch isn't going down low enough when you press or slam.
Open the trunk, use a screwdriver in the slot to close the catch. Get someone to open the trunk release and watch it open. It it does, it works. You need to slacken off the bolts on the catch or the keeper plate and move it closer.
Oh look, a RECALL!
2013 Ford Focus trunk latch recall
Ford Motor Company (Ford) is recalling certain model year 2013-2017 Ford Focus hatchback vehicles manufactured February 14, 2012, to August 26, 2016 and equipped with a manual transmission. The hatchback of the affected vehicles may be unlatched with a single press of the interior latch release button.
2013 Ford Focus Recalls ' Cars.com
https://www.cars.com > ... > Safety & recalls > Ford > Focus
Search for: 2013 Ford Focus trunk latch recall
There is a video here.
https://www.google.com/search?q=2013+ford+focus+adjust+trunk+latch
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Do you mean the one on the inside of the car or the remote button?
Are you saying the one inside the car or the remote?
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