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My buddy uses these on all his cars (3), that are parked in his pole shed and never has a mouse issue. He also has chickens (they love to hunt mice) roaming around.
Get a pop tart with blueberry stuffing smash it into the trap. Or crunch p nut butter get some on a spoon let it set in fridge until hardens up smash it into trap. They will not get away. Those traps they make nowadays are crap. You need to modify them a bit. Out smart the critter. Or get a big black snake and let him be your rodent control.
I used to be in the habit of keeping my window partially open when parked inside my Garage/Shop. Stopped doing that when i was drinking out of my coffee cup while running errands one day and i had forgotten to close the flap on my cup before i got out to walk into Homedepot. Drank from it till i got home and found a mouse inside it when i opened the lid to wash it out. I since don't leave the window open more than 1/8 inch . Never had a mouse in my vehicles since.