* Check for a hidden release: Some Mustangs might have a small, hidden release lever inside the cabin, possibly in the glove compartment or under the dash. Consult your owner's manual; it's your best bet to find this if it exists.
* Use a slim jim or similar tool: This is a risky method requiring skill and patience, as you risk damaging the locking mechanism. A professional locksmith is better equipped for this. A slim jim is inserted into the trunk lock mechanism to manipulate the latch. This is not recommended unless you are experienced. Improper use can cause damage.
* Emergency trunk release (if equipped): Some models may have a cable release under the back seat or another hidden location designed for this very scenario. Again, your owner's manual is your best friend here.
* Call a locksmith: A professional locksmith has specialized tools and expertise to open the trunk without causing damage. This is the safest and most reliable option.
* Tow truck: As a last resort, a tow truck can be used to access the trunk, though this is the most expensive option.
Strongly advise against attempting to break into the car yourself. You risk causing significant damage that will cost far more to repair than calling a professional. The locksmith or tow truck option is almost always the best financial and practical choice.