If you want to open a padlock and don't have the key, you can almost certainly break it open with 2 big wrenches.
I only had 1 opportunity to try that yet, when removing a 20 year old lock some stupid kid left on my stuff and then forgot where I put the key, but man did it feel empowering.
~~You can practice this trick at any romantic bridge. Do you really think whoever etched their initials on the lock is still together and would notice? Please~~