Could be a blown fuse, sticky door switch, or the light bulb needs replacement.
If the interior light works only when you open one door, look for a push button switch at the hinge side of the other (mind fingers). Try a squirt of WD40, or similar lubricant to make it actuate freely.
When one interior light is working, but another is not, then you may have a blown bulb. Try your nearest parts shop and let them know the exact make, model and year manufactured of your car for a replacement bulb. Ideally bring along the old one for comparison.
Remove the clear plastic lens from the light by unclipping it from the car ceiling fabric. You may need a thin flexible blade like a palette knife, or paint scraper to gently prise off the cover (make sure it's clean) like this picture of the Holden Astra TS 2001-2004.
If none of the interior lights is working, but other lights are, then maybe you have a blown fuse. The fuse panel is typically located under the front dash, or in the engine bay, but refer to your owner's guide for exact details.
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