If you were charged with a crime, you must get yourself an attorney. Let your attorney know that you are not a citizen as you should not plead to anything without making sure your immigration status is protected.
If you are interested in protecting your rights and getting the best possible resolution, then yes you should retain an attorney, even for a small case like shoplifting. Moreover, since you are not a citizen, obtaining legal counsel becomes more important as this case could have consequences that may affect your status in this country.
People often use slang to describe their charge. It appears you are describing a petit larceny but depending on the value of the property taken it may rise to the level of a felony. Additionally, you may be charged with a Burglary but I would need more facts to determine this. I would firmly suggest obtaining a lawyer and because he one in Las Vegas has already answered your question more than competently then perhaps you should call him. Good Luck.
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