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The alarm is indeed beeping because there is a problem with the circuit - probably as you suspect .
Have you tried pushing hard on the boot to be sure it is shut - and then try again?
Other than that - you will have to enter the boot from inside the car - this involves stripping out the back of the back seat - and armed with a torch and some tools - going through to the boot and releasing the clamp that holds the boot shut from either the boot itself or the body of the car --- once the boot comes open you can then deal with whatever jammed it .
I sincerely XXXXX XXXXX have helped you -
Kind rgds, MIKE
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