This is the 1425th most frequent French word.
los
"Los" is not a French word; it appears to be Spanish, meaning "the" (masculine plural definite article).
In this sentence, "les" is used as the plural definite article to specify the noun "clés" (keys). It's not related to "los."
Les clés sont dans le tiroir.
The keys are in the drawer.
"Les" is again the definite article used for plural nouns. "Los" would be the equivalent in Spanish for plural definite articles.
Cherchez les étoiles dans le ciel nocturne.
Search for the stars in the night sky.
Here "maux" is used, which might sound similar to "los" phonetically but has no connection because "los" isn’t standard French.