Things you could try:
Thorough Cleaning: Make sure the area around the mag release is clean and free of any dirt, debris, or fouling. Sometimes a buildup of grime can cause the mag release to stick.
Disassembly and Inspection: If cleaning doesn't work, you might need to disassemble the mag release and inspect it for damage or wear. There could be a spring or other part that needs to be replaced.
Lubrication: It's good that you've already tried some lubricants, but you might want to try a different one, like a silicone-based lubricant or a dry lubricant like graphite. These can sometimes work better than traditional oils.
Filing and Smoothing: If the problem persists, you might need to file or smooth out the mag release or the surrounding area. This should be done very carefully, as you don't want to damage the gun or make the problem worse.