Check the suitcase brand and look for the default code, often 000 or 0000
Align the numbers to the correct combination
Press or slide the release button, latch, or switch
If the lock has a TSA keyhole, do not use it unless you have the proper TSA key
Try the factory default code if the lock was never changed
Look for a reset button or lever only if you already know the current code
If you forgot the code, try combinations you may have set before
Inspect the lock for a small reset hole or instructions on the suitcase tag
Contact the manufacturer for model-specific instructions
Visit a locksmith or luggage repair shop if the lock will not open