Any Substitutes for cage locks?

Okay so my sugar glider has shown me his mater skills at opening his own cage door so I need a cage door lock. I don't want to buy then online and I don't want to go through the hle if zip-ties. So are there any stores that may have them? Or maybe like something that works like a lock. They have o be small almost like a diary lock but in many. They can even be keyless