The laws of God are for all people, all cultures for all time, unless the Bible specifically states otherwise (abrogration). The Psalmist says in Ps 19.7
"The law of the Lord is perfect, converting the soul:"
in fact the New Testament defines sin as "the transgression of the law", so if the law didn't apply to everyone, then there would be no need for Jesus' sacrifice.
in Matthew 5:17-19,
"Think not that I am come to destroy the law, or the
prophets: I am not come to destroy, but to fulfil. For verily I say
unto you, Till heaven and earth pass, one jot or one tittle shall in
no wise pass from the law, till all be fulfilled. Whosoever therefore
shall break one of these least commandments, and shall teach men so,
he shall be called the least in the kingdom of heaven: but whosoever
shall do and teach them, the same shall be called great in the kingdom
Certain laws were abrograted (fulfilled) by Jesus Christ, like circumcision, sabbath, food, ceremonial and sacrificial laws. God used the law as the standard to judge the heathen nations. They are in their essence the definition of right and wrong, they are our creator telling us how life works best (yes, they're more than that also). Some of the laws may not be relevant to our culture, but Paul teaches in 1 Cor 9:9 and 1 Tim 5:18 that we are to use the principles in the law and apply them to our modern situations. The principles (spirit) of the law transcend culture, time and space. Remember, if you don't choose to follow God's law, then you're following your own, thereby making yourself the God of your life.
If thou buy an Hebrew servant, six years he shall serve: and in the
seventh he shall go out free for nothing. If he came in by himself, he
shall go out by himself: if he were married, then his wife shall go
out with him. If his master have given him a wife, and she have born
him sons or daughters; the wife and her children shall be her
master’s, and he shall go out by himself. And if the servant shall
plainly say, I love my master, my wife, and my children; I will not go
out free: Then his master shall bring him unto the judges; he shall
also bring him to the door, or unto the door post; and his master
shall bore his ear through with an aul; and he shall serve him for
ever. And if a man sell his daughter to be a maidservant, she shall
not go out as the menservants do. If she please not her master, who
hath betrothed her to himself, then shall he let her be redeemed: to
sell her unto a strange nation he shall have no power, seeing he hath
dealt deceitfully with her. And if he have betrothed her unto his son,
he shall deal with her after the manner of daughters. If he take him
another wife; her food, her raiment, and her duty of marriage, shall
he not diminish. And if he do not these three unto her, then shall she
go out free without money.
This is referencing a particular brand of Ancient slavery (there are many types of slavery). The specifics would only apply to slavery of that type, which isn't practiced by and large in our society today, but the principles could still be used. For example the seven year release, tying in with the laws on releasing debt, have been used in our modern bankruptcy laws.
Both thy bondmen, and thy bondmaids, which thou shalt have, shall be
of the heathen that are round about you; of them shall ye buy bondmen
and bondmaids. Moreover of the children of the strangers that do
sojourn among you, of them shall ye buy, and of their families that
are with you, which they begat in your land: and they shall be your
possession. And ye shall take them as an inheritance for your children
after you, to inherit them for a possession; they shall be your
bondmen for ever: but over your brethren the children of Israel, ye
shall not rule one over another with rigour.
Again, a reference to a specific type of slavery that isn't being used in the modern "civilized" world.
1 Timothy 6:1-2
Let as many servants as are under the yoke count their own masters
worthy of all honour, that the name of God and his doctrine be not
blasphemed. And they that have believing masters, let them not despise
them, because they are brethren; but rather do them service, because
they are faithful and beloved, partakers of the benefit. These things
teach and exhort.
Since the modern job is just a different more voluntary form of slavery, slightly more advanced than indentured servitude, this would certainly apply to all employees.
If you aren't in your own business (includes family businesses and homemakers), or unemployed then you are in the position of voluntary slavery.
Note that we are all slaves ultimately; either to sin or to God, the choice is yours (Romans 6:16).