There could be several reasons why you are not able to open a refrigerator. Let's explore some of the possibilities:

1. The refrigerator is locked: Some refrigerators come with a lock feature to prevent unauthorized access. Check if the lock is engaged and unlock it if necessary.

2. The door is stuck: Over time， the refrigerator door gasket can accumulate debris and become caked with grime. This could prevent the door from opening smoothly. Check the gasket and clean it if needed.

3. The fridge is too full: If the fridge is overloaded， food items may block the door and prevent it from opening. Clear out some space and try again.

4. The power is off: If the refrigerator is not getting power from the mains， it will not open. Check the power cord and make sure it is plugged in properly.

5. The compressor is not working: The compressor is the heart of the refrigerator and if it is not working， the fridge will not cool properly. If you suspect this may be the issue， call a repair technician to diagnose and fix the problem.

In conclusion， if you cannot open a refrigerator， there could be a simple solution such as the door being stuck or the fridge being too full. However， if none of these solutions work， it might be an issue with the power or the compressor， which may require professional repair.