It is not recommended to attempt to open a disc lock without a key, as it may damage the lock or the object it is attached to. However, if you have lost the key and need to open the lock, here are a few methods that may work:
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Pick the lock: If you have experience with lock picking or have the appropriate tools, you may be able to pick the disc lock. This involves manipulating the pins inside the lock until they align and the lock opens. However, picking a lock without proper training or tools can cause damage to the lock, so this should only be attempted by experienced individuals.
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Use a shim: A thin, flat piece of metal or plastic called a shim can be used to slip between the locking mechanism and the shackle of the lock, bypassing the need for the key. This method requires some skill and patience but can be effective for some types of disc locks.
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Use bolt cutters: If the disc lock is attached to a chain or other object that can be cut, you may be able to use bolt cutters to cut through the chain and remove the lock. However, this method will likely damage the chain and lock and should only be used as a last resort.
It is important to note that attempting to open a lock without a key may be illegal and could result in damage to property or injury. It is always recommended to contact a professional locksmith if you need assistance opening a lock.

