To effectively lock a toy crane machine and prevent unsupervised use, several practical methods are available. The most common and secure solution is to install a dedicated coin-operated lock or a cabinet lock. These are typically keyed locks that physically prevent the coin mechanism from being accessed or the main power switch from being turned on. For a simpler approach, you can use a padlock and hasp to secure the main door or power cord compartment. Unplugging the machine and storing the power cord in a locked location is another straightforward deterrent. For environments with children, consider implementing a physical barrier or storing the machine in a locked room when not in use. Always refer to the manufacturer's instructions for recommended locking points and compatible security hardware. Regularly check the integrity of the locks and maintain control over the keys. These steps help ensure safety, prevent unauthorized play, and protect your machine from damage or misuse.