A federal judge yesterday sentenced three men convicted of armed burglary, assault and other charges in the takeover of a Georgetown boutique last November to prison terms that are less than defense attorneys suggested.

Judge Barrington D. Parker ordered that Leon Bullock, 23, of 2504 14th St. NE, and Robert Johnson, 23, of 4335 Ponds St. NE, serve sentences ranging from 5 to 15 years in prison. He ordered Wayne E. Joyner, 22, of 6110 Breezewood Dr., Greenbelt, to serve 4 to 14 years.

Two of the charges of which all three were convicted carry maximum terms of 15 years to life in prison.

Defense attorneys suggested to Parker that he set the minimum portion of his sentences in the range of 8 to 10 years. By law, the maximum time of the suggested penalty would be 24 to 30 years.

U.S. Attorney Earl J. Silbert asked the judge to mete out the maximum, and that the penalties for the crimes be made to run consecutively. He noted that each of the three was on parole on previous armed robbery convictions at he time they took over the Alonso Boutique Ltd., 1610 Wisconsin Ave. NW, last Nov. 15.

Silbert asked that the sentences also be made to run consecutively to the remainder of the time the three must serv on their prior convictions. Parker ordered that the sentences imposed yesterday be served concurrently, but that they begin after terms imposed earlier for the other crimes.

Five persons were held hostage for more than three hours at the boutique, but the three were found innocent of kidnaping charges at their trial.

In handing down the sentences, Judge Parker said he was more concerned with rebailitation than with punishment or deterrence.